diff --git a/Package.swift b/Package.swift
index 45cf233d..970de1f5 100644
--- a/Package.swift
+++ b/Package.swift
@@ -60,7 +60,7 @@ let appTargets: [Target] = [
     // "DigUp": on a case-insensitive disk it would collide with the `digup` CLI binary.)
     .executableTarget(
         name: "DigUpApp",
-        dependencies: ["DigUpKit", .product(name: "Sparkle", package: "Sparkle")],
+        dependencies: ["DigUpKit", "DigUpLocalization", .product(name: "Sparkle", package: "Sparkle")],
         swiftSettings: [.defaultIsolation(MainActor.self)],
         linkerSettings: [.unsafeFlags(["-Xlinker", "-rpath", "-Xlinker", "@executable_path/../Frameworks"])]
     ),
@@ -73,6 +73,7 @@ let appTargets: [Target] = []
 
 let package = Package(
     name: "DigUp",
+    defaultLocalization: "en",
     platforms: [.macOS(.v14)],
     products: [
         .executable(name: "digup", targets: ["digup"]),
@@ -82,6 +83,8 @@ let package = Package(
     targets: portableTargets + [
         // The engine: crawler, extractors, index store, the embedder interface and worker client, search. No UI.
         // Platform/ holds what differs by OS (Apple's frameworks on macOS, the C libraries above elsewhere).
+        .target(name: "DigUpLocalization", resources: [.process("Resources")]),
+        .testTarget(name: "DigUpLocalizationTests", dependencies: ["DigUpLocalization"]),
         .target(name: "DigUpKit", dependencies: engineDependencies, linkerSettings: engineLink),
         // llama.cpp (scripts/build-llama.sh builds it into Vendor/llama) and EmbeddingGemma 2 on it.
         .systemLibrary(name: "CLlama", path: llamaModule),
diff --git a/Sources/DigUpApp/AddFolders.swift b/Sources/DigUpApp/AddFolders.swift
index 2130277d..02c9e377 100644
--- a/Sources/DigUpApp/AddFolders.swift
+++ b/Sources/DigUpApp/AddFolders.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import SwiftUI
@@ -54,7 +55,7 @@ final class AddFoldersController {
                                   add: { [weak self] in self?.add() })
         let sheet = NSWindow(contentViewController: NSHostingController(rootView: view))
         sheet.styleMask = [.titled]
-        sheet.title = code ? "Code Folders" : "Add Folders"
+        sheet.title = code ? L10n.text("Code Folders") : L10n.text("Add Folders")
         self.sheet = sheet
         choices.startEstimates()
         log("add folders: \(choices.rows.count) to choose from")
@@ -105,17 +106,17 @@ private struct AddFoldersView: View {
         VStack(spacing: 0) {
             VStack(alignment: .leading, spacing: 16) {
                 if choices.code {
-                    StepTitle(title: "Search your code",
-                              subtitle: "Pick the folders that hold your projects; open one to pick among its repos. "
-                                  + "DigUp reads each once, then what changes. Code is searched on its own: type "
-                                  + "code: in the search panel.")
+                    StepTitle(title: L10n.text("Search your code"),
+                              subtitle: L10n.text("Pick the folders that hold your projects; open one to pick among its repos. ")
+                                  + L10n.text("DigUp reads each once, then what changes. Code is searched on its own: type ")
+                                  + L10n.text("code: in the search panel."))
                 } else {
-                    StepTitle(title: "Add folders to search",
-                              subtitle: "DigUp reads a new folder once, then keeps up with what changes in it. "
-                                  + "Open a folder to pick some of its subfolders.")
+                    StepTitle(title: L10n.text("Add folders to search"),
+                              subtitle: L10n.text("DigUp reads a new folder once, then keeps up with what changes in it. ")
+                                  + L10n.text("Open a folder to pick some of its subfolders."))
                 }
                 ScrollView {
-                    FolderList(choices: choices, addTitle: "Choose Another Folder…", add: pick)
+                    FolderList(choices: choices, addTitle: L10n.text("Choose Another Folder…"), add: pick)
                     if choices.code { CodeFolderNote().padding(.top, 8) }
                 }
                 .scrollBounceBehavior(.basedOnSize)
@@ -130,9 +131,9 @@ private struct AddFoldersView: View {
                     .foregroundStyle(.secondary)
                     .lineLimit(1)
                 Spacer(minLength: 8)
-                Button("Cancel", action: cancel)
+                Button(L10n.text("Cancel"), action: cancel)
                     .keyboardShortcut(.cancelAction)
-                Button("Add", action: add)
+                Button(L10n.text("Add"), action: add)
                     .keyboardShortcut(.defaultAction)
                     .disabled(!choices.changesSomething)
             }
@@ -144,15 +145,15 @@ private struct AddFoldersView: View {
     }
 
     private var summary: String {
-        guard choices.changesSomething else { return "Check the folders to add" }
-        guard choices.estimatesDone else { return "Looking at the folders…" }
-        let time = choices.totalSeconds < 1 ? "under a second" : "about \(roughDuration(choices.totalSeconds))"
+        guard choices.changesSomething else { return L10n.text("Check the folders to add") }
+        guard choices.estimatesDone else { return L10n.text("Looking at the folders…") }
+        let time = choices.totalSeconds < 1 ? L10n.text("under a second") : L10n.format("about %1$@", String(describing: roughDuration(choices.totalSeconds)))
         if choices.code {
-            return "Adds \(time) of indexing and \(roughBytes(choices.totalBytes))"
+            return L10n.format("Adds %1$@ of indexing and %2$@", String(describing: time), String(describing: roughBytes(choices.totalBytes)))
         }
         let later = choices.totalLaterSeconds
-        return "Adds \(time) of indexing"
-            + (later >= 30 ? ", and \(roughDuration(later)) more for long files" : "")
+        return L10n.format("Adds %1$@ of indexing", String(describing: time))
+            + (later >= 30 ? L10n.format(", and %1$@ more for long files", String(describing: roughDuration(later))) : "")
     }
 }
 
@@ -160,8 +161,8 @@ private struct AddFoldersView: View {
 struct CodeFolderNote: View {
     var body: some View {
         Label {
-            Text("Code search reads source files, notebooks and a repo's own docs. It skips what git ignores, vendored "
-                 + "and generated code, data files, and anything that looks like a key or a password.")
+            Text(L10n.text("Code search reads source files, notebooks and a repo's own docs. It skips what git ignores, vendored ")
+                 + L10n.text("and generated code, data files, and anything that looks like a key or a password."))
                 .fixedSize(horizontal: false, vertical: true)
         } icon: {
             Image(systemName: "info.circle")
diff --git a/Sources/DigUpApp/App.swift b/Sources/DigUpApp/App.swift
index 64ec3d1d..5553622d 100644
--- a/Sources/DigUpApp/App.swift
+++ b/Sources/DigUpApp/App.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 
 @main
@@ -63,31 +64,31 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
         let mainMenu = NSMenu()
 
         let appMenu = NSMenu()
-        appMenu.addItem(withTitle: "About DigUp", action: #selector(NSApplication.orderFrontStandardAboutPanel(_:)),
+        appMenu.addItem(withTitle: L10n.text("About DigUp"), action: #selector(NSApplication.orderFrontStandardAboutPanel(_:)),
                         keyEquivalent: "")
-        appMenu.addItem(ActionMenuItem("Check for Updates…") { [weak app] in app?.updates.checkNow() })
+        appMenu.addItem(ActionMenuItem(L10n.text("Check for Updates…")) { [weak app] in app?.updates.checkNow() })
         appMenu.addItem(.separator())
-        appMenu.addItem(ActionMenuItem("Settings…", key: ",") { [weak app] in app?.showSettings() })
+        appMenu.addItem(ActionMenuItem(L10n.text("Settings…"), key: ",") { [weak app] in app?.showSettings() })
         appMenu.addItem(.separator())
-        appMenu.addItem(withTitle: "Hide DigUp", action: #selector(NSApplication.hide(_:)), keyEquivalent: "h")
-        appMenu.addItem(withTitle: "Quit DigUp", action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q")
+        appMenu.addItem(withTitle: L10n.text("Hide DigUp"), action: #selector(NSApplication.hide(_:)), keyEquivalent: "h")
+        appMenu.addItem(withTitle: L10n.text("Quit DigUp"), action: #selector(NSApplication.terminate(_:)), keyEquivalent: "q")
 
-        let fileMenu = NSMenu(title: "File")
-        fileMenu.addItem(ActionMenuItem("New Search", key: "n") { [weak app] in app?.showSearchWindow(query: "") })
-        fileMenu.addItem(withTitle: "Close", action: #selector(NSWindow.performClose(_:)), keyEquivalent: "w")
+        let fileMenu = NSMenu(title: L10n.text("File"))
+        fileMenu.addItem(ActionMenuItem(L10n.text("New Search"), key: "n") { [weak app] in app?.showSearchWindow(query: "") })
+        fileMenu.addItem(withTitle: L10n.text("Close"), action: #selector(NSWindow.performClose(_:)), keyEquivalent: "w")
 
-        let editMenu = NSMenu(title: "Edit")
-        editMenu.addItem(withTitle: "Undo", action: Selector(("undo:")), keyEquivalent: "z")
-        editMenu.addItem(withTitle: "Redo", action: Selector(("redo:")), keyEquivalent: "Z")
+        let editMenu = NSMenu(title: L10n.text("Edit"))
+        editMenu.addItem(withTitle: L10n.text("Undo"), action: Selector(("undo:")), keyEquivalent: "z")
+        editMenu.addItem(withTitle: L10n.text("Redo"), action: Selector(("redo:")), keyEquivalent: "Z")
         editMenu.addItem(.separator())
-        editMenu.addItem(withTitle: "Cut", action: #selector(NSText.cut(_:)), keyEquivalent: "x")
-        editMenu.addItem(withTitle: "Copy", action: #selector(NSText.copy(_:)), keyEquivalent: "c")
-        editMenu.addItem(withTitle: "Paste", action: #selector(NSText.paste(_:)), keyEquivalent: "v")
-        editMenu.addItem(withTitle: "Select All", action: #selector(NSText.selectAll(_:)), keyEquivalent: "a")
-
-        let windowMenu = NSMenu(title: "Window")
-        windowMenu.addItem(withTitle: "Minimize", action: #selector(NSWindow.performMiniaturize(_:)), keyEquivalent: "m")
-        windowMenu.addItem(withTitle: "Close", action: #selector(NSWindow.performClose(_:)), keyEquivalent: "")
+        editMenu.addItem(withTitle: L10n.text("Cut"), action: #selector(NSText.cut(_:)), keyEquivalent: "x")
+        editMenu.addItem(withTitle: L10n.text("Copy"), action: #selector(NSText.copy(_:)), keyEquivalent: "c")
+        editMenu.addItem(withTitle: L10n.text("Paste"), action: #selector(NSText.paste(_:)), keyEquivalent: "v")
+        editMenu.addItem(withTitle: L10n.text("Select All"), action: #selector(NSText.selectAll(_:)), keyEquivalent: "a")
+
+        let windowMenu = NSMenu(title: L10n.text("Window"))
+        windowMenu.addItem(withTitle: L10n.text("Minimize"), action: #selector(NSWindow.performMiniaturize(_:)), keyEquivalent: "m")
+        windowMenu.addItem(withTitle: L10n.text("Close"), action: #selector(NSWindow.performClose(_:)), keyEquivalent: "")
         NSApp.windowsMenu = windowMenu
 
         for submenu in [appMenu, fileMenu, editMenu, windowMenu] {
diff --git a/Sources/DigUpApp/AppController.swift b/Sources/DigUpApp/AppController.swift
index f061d628..20956a5a 100644
--- a/Sources/DigUpApp/AppController.swift
+++ b/Sources/DigUpApp/AppController.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import ServiceManagement
@@ -202,14 +203,14 @@ final class AppController {
     }
 
     /// Asks for folders with the standard open panel (as a sheet when there's a window).
-    func pickFolders(for window: NSWindow?, prompt: String = "Add", then done: @escaping ([URL]) -> Void) {
+    func pickFolders(for window: NSWindow?, prompt: String = L10n.text("Add"), then done: @escaping ([URL]) -> Void) {
         let panel = NSOpenPanel()
         panel.canChooseDirectories = true
         panel.canChooseFiles = false
         panel.allowsMultipleSelection = true
         panel.canCreateDirectories = false
         panel.prompt = prompt
-        panel.message = "Choose folders for DigUp to search."
+        panel.message = L10n.text("Choose folders for DigUp to search.")
         let finish = { (response: NSApplication.ModalResponse) in
             done(response == .OK ? panel.urls.map { AppSettings.folderURL($0.path) } : [])
         }
@@ -234,7 +235,7 @@ final class AppController {
     /// Nil when `combo` is now the hotkey, else why it can't be.
     func setHotkey(_ combo: KeyCombo) -> String? {
         if let conflict = combo.systemConflict { return conflict }
-        guard hotkeys.register(combo) else { return "Another app is using \(combo.display)" }
+        guard hotkeys.register(combo) else { return L10n.format("Another app is using %1$@", String(describing: combo.display)) }
         AppSettings.save(hotkey: combo.spec)
         model.settings.hotkey = combo.spec
         model.hotkey = combo
diff --git a/Sources/DigUpApp/AppModel.swift b/Sources/DigUpApp/AppModel.swift
index 6f67d386..8a3f13cb 100644
--- a/Sources/DigUpApp/AppModel.swift
+++ b/Sources/DigUpApp/AppModel.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import Observation
 
@@ -23,41 +24,41 @@ final class AppModel {
     /// One line for the menu and the windows: what the index is doing.
     var statusLine: String {
         let status = self.status
-        guard hasFolders else { return "No folders chosen yet" }
+        guard hasFolders else { return L10n.text("No folders chosen yet") }
         switch status.activity {
-        case .starting: return "Starting…"
+        case .starting: return L10n.text("Starting…")
         case .failed(let problem): return "⚠︎ \(problem)"
-        case .syncing: return "Checking folders…"
+        case .syncing: return L10n.text("Checking folders…")
         case .indexing(let done, let total):
             let percent = total > 0 ? Int((Double(done) / Double(total) * 100).rounded(.down)) : 0
-            return "Indexing \(percent)% · \(done.formatted()) of \(total.formatted())"
+            return L10n.format("Indexing %1$@%% · %2$@ of %3$@", String(describing: percent), String(describing: done.formatted()), String(describing: total.formatted()))
         case .finishing(let done, let total, let files):
             let percent = total > 0 ? Int((Double(done) / Double(total) * 100).rounded(.down)) : 0
-            let which = files > 0 ? "\(files.formatted()) long \(files == 1 ? "file" : "files")" : "long files"
-            return "Reading the rest of \(which) · \(percent)%"
+            let which = files > 0 ? L10n.format("%1$@ long %2$@", String(describing: files.formatted()), String(describing: files == 1 ? "file" : "files")) : L10n.text("long files")
+            return L10n.format("Reading the rest of %1$@ · %2$@%%", String(describing: which), String(describing: percent))
         case .idle:
             if let line = downloadLine { return line }
             if let code = status.code.indexing, code.total > 0 {
                 let percent = Int((Double(code.done) / Double(code.total) * 100).rounded(.down))
-                return "Indexing code \(percent)% · \(code.done.formatted()) of \(code.total.formatted())"
+                return L10n.format("Indexing code %1$@%% · %2$@ of %3$@", String(describing: percent), String(describing: code.done.formatted()), String(describing: code.total.formatted()))
             }
-            let waiting = "\(status.pending.formatted()) \(status.pending == 1 ? "file" : "files") waiting"
-            if status.pending > 0, status.paused { return "Paused · \(waiting)" }
+            let waiting = L10n.format("%1$@ %2$@ waiting", String(describing: status.pending.formatted()), String(describing: status.pending == 1 ? "file" : "files"))
+            if status.pending > 0, status.paused { return L10n.format("Paused · %1$@", String(describing: waiting)) }
             if let until = status.heldUntil, !status.paused {
                 // Outside the set hours: what's known to wait, and when indexing starts again.
-                let when = "indexing from \(until.formatted(date: .omitted, time: .shortened))"
+                let when = L10n.format("indexing from %1$@", until.formatted(date: .omitted, time: .shortened))
                 if status.pending > 0 { return "\(waiting) · \(when)" }
-                return "\(status.searchable.formatted()) \(status.searchable == 1 ? "file" : "files") indexed · \(when)"
+                return L10n.format("%1$@ %2$@ indexed · %3$@", status.searchable.formatted(), status.searchable == 1 ? "file" : "files", when)
             }
             if status.pending > 0, let reason = status.waitingFor { return "\(waiting) · \(reason)" }
-            if status.pending > 0 { return "\(waiting) to be indexed" }
+            if status.pending > 0 { return L10n.format("%1$@ to be indexed", String(describing: waiting)) }
             if status.unfinished > 0 {
-                let rest = "\(status.unfinished.formatted()) long \(status.unfinished == 1 ? "file" : "files") to finish"
-                if status.paused { return "Paused · \(rest)" }
+                let rest = L10n.format("%1$@ long %2$@ to finish", String(describing: status.unfinished.formatted()), String(describing: status.unfinished == 1 ? "file" : "files"))
+                if status.paused { return L10n.format("Paused · %1$@", String(describing: rest)) }
                 if let reason = status.waitingFor { return "\(rest) · \(reason)" }
             }
-            return "\(status.searchable.formatted()) \(status.searchable == 1 ? "file" : "files") indexed"
-                + (status.paused ? " · paused" : "")
+            return L10n.format("%1$@ %2$@ indexed", String(describing: status.searchable.formatted()), String(describing: status.searchable == 1 ? "file" : "files"))
+                + (status.paused ? L10n.text(" · paused") : "")
         }
     }
 
@@ -65,11 +66,11 @@ final class AppModel {
     private var downloadLine: String? {
         switch download.phase {
         case .ready: nil
-        case .downloading: "Downloading the model · \(Int(download.fraction * 100))%"
-        case .verifying: "Checking the model download…"
-        case .retrying: "Model download: waiting for the network"
-        case .failed: "⚠︎ The model download stopped"
-        case .needed: status.pending > 0 ? "The model isn't downloaded yet" : nil
+        case .downloading: L10n.format("Downloading the model · %1$@%%", String(describing: Int(download.fraction * 100)))
+        case .verifying: L10n.text("Checking the model download…")
+        case .retrying: L10n.text("Model download: waiting for the network")
+        case .failed: L10n.text("⚠︎ The model download stopped")
+        case .needed: status.pending > 0 ? L10n.text("The model isn't downloaded yet") : nil
         }
     }
 
@@ -89,34 +90,32 @@ final class AppModel {
     /// One line about the code index, for Settings → Code: "812 code files indexed", "Indexing code 42%…".
     var codeStatusLine: String {
         let code = status.code
-        guard hasCode else { return "Code search is off" }
-        if !download.isReady { return "Code is read once the model has downloaded" }
+        guard hasCode else { return L10n.text("Code search is off") }
+        if !download.isReady { return L10n.text("Code is read once the model has downloaded") }
         if let indexing = code.indexing, indexing.total > 0 {
             let percent = Int((Double(indexing.done) / Double(indexing.total) * 100).rounded(.down))
-            return "Indexing code \(percent)% · \(indexing.done.formatted()) of \(indexing.total.formatted())"
+            return L10n.format("Indexing code %1$@%% · %2$@ of %3$@", String(describing: percent), String(describing: indexing.done.formatted()), String(describing: indexing.total.formatted()))
         }
-        let waiting = code.pending > 0 ? " · \(code.pending.formatted()) waiting" : ""
-        if code.pending > 0, status.paused { return "Paused · \(code.pending.formatted()) code files waiting" }
-        if code.pending > 0, let reason = status.waitingFor { return "\(code.pending.formatted()) code files waiting · \(reason)" }
+        let waiting = code.pending > 0 ? L10n.format(" · %1$@ waiting", String(describing: code.pending.formatted())) : ""
+        if code.pending > 0, status.paused { return L10n.format("Paused · %1$@ code files waiting", String(describing: code.pending.formatted())) }
+        if code.pending > 0, let reason = status.waitingFor { return L10n.format("%1$@ code files waiting · %2$@", String(describing: code.pending.formatted()), String(describing: reason)) }
         if code.pending > 0, let until = status.heldUntil {
-            return "\(code.pending.formatted()) code files waiting · indexing from "
-                + until.formatted(date: .omitted, time: .shortened)
+            return L10n.format("%1$@ code files waiting · indexing from %2$@", code.pending.formatted(), until.formatted(date: .omitted, time: .shortened))
         }
         // Code is read once the other folders have nothing waiting (the helper's order).
         if code.pending > 0, status.pending > 0 {
-            let files = "\(code.pending.formatted()) code \(code.pending == 1 ? "file" : "files")"
-            return files + " waiting · read after your other files"
+            return L10n.format("%1$@ code %2$@ waiting · read after your other files", code.pending.formatted(), code.pending == 1 ? "file" : "files")
         }
-        return "\(code.searchable.formatted()) code \(code.searchable == 1 ? "file" : "files") indexed" + waiting
+        return L10n.format("%1$@ code %2$@ indexed", String(describing: code.searchable.formatted()), String(describing: code.searchable == 1 ? "file" : "files")) + waiting
     }
 
     /// A few words for the search bar while results may be incomplete: "Indexing 42%", "Downloading model · 42%".
     var activityBadge: String? {
-        if download.isActive { return "Downloading model · \(Int(download.fraction * 100))%" }
+        if download.isActive { return L10n.format("Downloading model · %1$@%%", String(describing: Int(download.fraction * 100))) }
         if case .indexing(let done, let total) = status.activity, total > 0 {
-            return "Indexing \(Int(Double(done) / Double(total) * 100))%"
+            return L10n.format("Indexing %1$@%%", String(describing: Int(Double(done) / Double(total) * 100)))
         }
-        if status.paused, status.pending > 0 { return "Indexing paused" }
+        if status.paused, status.pending > 0 { return L10n.text("Indexing paused") }
         return nil
     }
 
@@ -124,19 +123,19 @@ final class AppModel {
     var meaningUnavailable: String? {
         guard !download.isReady else { return nil }
         if download.isActive {
-            return "Matching words only until the model has downloaded (\(Int(download.fraction * 100))%)"
+            return L10n.format("Matching words only until the model has downloaded (%1$@%%)", String(describing: Int(download.fraction * 100)))
         }
-        return "Matching words only: the model isn't downloaded"
+        return L10n.text("Matching words only: the model isn't downloaded")
     }
 
     /// Why results may be incomplete right now, or nil.
     var resultsCaveat: String? {
         if let meaningUnavailable { return meaningUnavailable }
         if case .indexing(let done, let total) = status.activity, total > 0 {
-            return "Still indexing (\(Int(Double(done) / Double(total) * 100))%): some files aren't in yet"
+            return L10n.format("Still indexing (%1$@%%): some files aren't in yet", String(describing: Int(Double(done) / Double(total) * 100)))
         }
         if status.pending > 0 {
-            return "\(status.pending.formatted()) \(status.pending == 1 ? "file isn't" : "files aren't") indexed yet"
+            return L10n.format("%1$@ %2$@ indexed yet", String(describing: status.pending.formatted()), String(describing: status.pending == 1 ? "file isn't" : "files aren't"))
         }
         return nil
     }
diff --git a/Sources/DigUpApp/AppSettings.swift b/Sources/DigUpApp/AppSettings.swift
index 62634830..fb74790c 100644
--- a/Sources/DigUpApp/AppSettings.swift
+++ b/Sources/DigUpApp/AppSettings.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import DigUpKit
 import Foundation
 
@@ -49,8 +50,8 @@ nonisolated struct AppSettings: Sendable {
     static let defaultHotkey = "cmd+shift+space"
 
     /// The battery switch, in onboarding and Settings.
-    static let batteryTitle = "Index on battery power"
-    static let batteryDetail = "When it's off, a folder's first pass waits for a charger. New files always go in right away."
+    static let batteryTitle = L10n.text("Index on battery power")
+    static let batteryDetail = L10n.text("When it's off, a folder's first pass waits for a charger. New files always go in right away.")
 
     /// Where settings are saved. Reads see launch arguments first either way. (UserDefaults is thread-safe.)
     nonisolated(unsafe) static let defaults: UserDefaults = {
diff --git a/Sources/DigUpApp/CodeEditors.swift b/Sources/DigUpApp/CodeEditors.swift
index 7139cc85..0e62346b 100644
--- a/Sources/DigUpApp/CodeEditors.swift
+++ b/Sources/DigUpApp/CodeEditors.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 
@@ -52,7 +53,7 @@ nonisolated struct CodeEditor: Identifiable, Hashable, Sendable {
     ]
 
     /// Each file opens in the app macOS opens it with, at its start.
-    static let defaultApp = CodeEditor(id: "", name: "The file's default app", method: .plain)
+    static let defaultApp = CodeEditor(id: "", name: L10n.text("The file's default app"), method: .plain)
 
     /// Where code results open now (`AppController.setCodeEditor`).
     @MainActor static var current = defaultApp
diff --git a/Sources/DigUpApp/Components.swift b/Sources/DigUpApp/Components.swift
index ea0ad122..c6f40a5d 100644
--- a/Sources/DigUpApp/Components.swift
+++ b/Sources/DigUpApp/Components.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import SwiftUI
@@ -87,7 +88,7 @@ struct MomentBar: View {
             }
         }
         .frame(height: 4)
-        .accessibilityLabel("At \(ResultRow.clock(start)) of \(ResultRow.clock(duration))")
+        .accessibilityLabel(L10n.format("At %1$@ of %2$@", String(describing: ResultRow.clock(start)), String(describing: ResultRow.clock(duration))))
     }
 }
 
@@ -133,13 +134,13 @@ extension FileKind {
     func counted(_ count: Int) -> String {
         let one = count == 1
         let noun = switch self {
-        case .screenshot: one ? "screenshot" : "screenshots"
-        case .image: one ? "image" : "images"
-        case .pdf: one ? "PDF" : "PDFs"
-        case .doc: one ? "document" : "documents"
-        case .audio: one ? "audio file" : "audio files"
-        case .video: one ? "video" : "videos"
-        case .code: one ? "code file" : "code files"
+        case .screenshot: one ? L10n.text("screenshot") : L10n.text("screenshots")
+        case .image: one ? L10n.text("image") : L10n.text("images")
+        case .pdf: one ? "PDF" : L10n.text("PDFs")
+        case .doc: one ? L10n.text("document") : L10n.text("documents")
+        case .audio: one ? L10n.text("audio file") : L10n.text("audio files")
+        case .video: one ? L10n.text("video") : L10n.text("videos")
+        case .code: one ? L10n.text("code file") : L10n.text("code files")
         }
         return "\(count.formatted()) \(noun)"
     }
@@ -194,11 +195,11 @@ struct ShortcutRecorder: View {
             Button { setRecording(!recording) } label: {
                 Group {
                     if recording {
-                        Text("Press the new shortcut…").foregroundStyle(.secondary)
+                        Text(L10n.text("Press the new shortcut…")).foregroundStyle(.secondary)
                     } else if let combo {
                         Keycaps(caps: combo.caps, size: capSize)
                     } else {
-                        Text("Click to set a shortcut").foregroundStyle(.secondary)
+                        Text(L10n.text("Click to set a shortcut")).foregroundStyle(.secondary)
                     }
                 }
                 .font(.system(size: 13))
@@ -213,8 +214,8 @@ struct ShortcutRecorder: View {
             }
             .buttonStyle(.plain)
             .background(KeyCatcher(active: recording, onKey: handle, onResign: { setRecording(false) }))
-            .accessibilityLabel(recording ? "Recording a new shortcut" : "Shortcut \(combo?.display ?? "none"), click to change")
-            Text(problem ?? (recording ? "Esc cancels" : "Click to change"))
+            .accessibilityLabel(recording ? L10n.text("Recording a new shortcut") : L10n.format("Shortcut %1$@, click to change", String(describing: combo?.display ?? L10n.text("none"))))
+            Text(problem ?? (recording ? L10n.text("Esc cancels") : L10n.text("Click to change")))
                 .font(.system(size: 11))
                 .foregroundStyle(problem == nil ? AnyShapeStyle(.tertiary) : AnyShapeStyle(Color.red))
                 .multilineTextAlignment(.center)
@@ -234,7 +235,7 @@ struct ShortcutRecorder: View {
                                                                                                .numericPad])
         if event.keyCode == 53, flags.isEmpty { return setRecording(false) }   // Esc
         guard let combo = KeyCombo(keyCode: event.keyCode, flags: flags) else {
-            problem = "Use ⌘, ⌥ or ⌃ with a key"
+            problem = L10n.text("Use ⌘, ⌥ or ⌃ with a key")
             return
         }
         if let why = apply(combo) {
diff --git a/Sources/DigUpApp/DebugHooks.swift b/Sources/DigUpApp/DebugHooks.swift
index 45324d33..ec8a3f56 100644
--- a/Sources/DigUpApp/DebugHooks.swift
+++ b/Sources/DigUpApp/DebugHooks.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import Quartz
 import ServiceManagement
@@ -154,10 +155,10 @@ enum DebugHooks {
             let menu = app.statusMenu!
             DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) {
                 log("menu: \(menu.describeMenu())")
-                menu.performItem(titled: "Pause Indexing")
+                menu.performItem(titled: L10n.text("Pause Indexing"))
                 DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                     log("menu after Pause: \(menu.describeMenu())")
-                    menu.performItem(titled: "Resume Indexing")
+                    menu.performItem(titled: L10n.text("Resume Indexing"))
                     DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                         log("menu after Resume: \(menu.describeMenu())")
                     }
diff --git a/Sources/DigUpApp/Engine.swift b/Sources/DigUpApp/Engine.swift
index a91121f6..517c0b00 100644
--- a/Sources/DigUpApp/Engine.swift
+++ b/Sources/DigUpApp/Engine.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import DigUpKit
 import Foundation
 
@@ -209,7 +210,7 @@ nonisolated final class Engine: @unchecked Sendable {
     func start() {
         searchQueue.async { [self] in
             guard openSearcher() else {
-                update { $0.activity = .failed("Can't open the index") }
+                update { $0.activity = .failed(L10n.text("Can't open the index")) }
                 return
             }
             indexQueue.async { [self] in startHelper() }
@@ -527,7 +528,7 @@ nonisolated final class Engine: @unchecked Sendable {
             try process.run()
         } catch {
             log("indexer: can't start \(process.executableURL?.path ?? "the helper"): \(error)")
-            update { $0.activity = .failed("Can't start indexing") }
+            update { $0.activity = .failed(L10n.text("Can't start indexing")) }
             return
         }
         helper = process
@@ -636,7 +637,7 @@ nonisolated final class Engine: @unchecked Sendable {
             log("indexer: the model or settings changed, indexing everything again (was: \(event["from"] as? String ?? "?"))")
         case "error":
             log("indexer: \(event["message"] as? String ?? "error")")
-            if event["fatal"] as? Bool == true { update { $0.activity = .failed("Indexing stopped") } }
+            if event["fatal"] as? Bool == true { update { $0.activity = .failed(L10n.text("Indexing stopped")) } }
         default:
             break
         }
@@ -678,7 +679,7 @@ nonisolated final class Engine: @unchecked Sendable {
             log("indexer: the model changed, the code index starts over")
         case "error":
             log("indexer: code: \(event["message"] as? String ?? "error")")
-            if event["fatal"] as? Bool == true { update { $0.activity = .failed("Indexing stopped") } }
+            if event["fatal"] as? Bool == true { update { $0.activity = .failed(L10n.text("Indexing stopped")) } }
         default:
             break
         }
diff --git a/Sources/DigUpApp/Estimates.swift b/Sources/DigUpApp/Estimates.swift
index d226707f..52dd4da1 100644
--- a/Sources/DigUpApp/Estimates.swift
+++ b/Sources/DigUpApp/Estimates.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import DigUpKit
 import Foundation
 
@@ -136,15 +137,15 @@ nonisolated final class LineBuffer: @unchecked Sendable {
 
 /// "≈ 8 s", "≈ 2 min", or "< 1 s" for a few short files.
 nonisolated func approximately(_ seconds: Double) -> String {
-    seconds < 0.5 ? "< 1 s" : "≈ \(roughDuration(seconds))"
+    seconds < 0.5 ? L10n.text("< 1 s") : "≈ \(roughDuration(seconds))"
 }
 
 /// "8 s", "2 min", "1.5 h": the precision an estimate deserves.
 nonisolated func roughDuration(_ seconds: Double) -> String {
     switch seconds {
-    case ..<90: "\(Int(seconds.rounded())) s"
-    case ..<5400: "\(Int((seconds / 60).rounded())) min"
-    default: String(format: "%.1f h", seconds / 3600)
+    case ..<90: L10n.format("%1$@ s", String(describing: Int(seconds.rounded())))
+    case ..<5400: L10n.format("%1$@ min", String(describing: Int((seconds / 60).rounded())))
+    default: String(format: L10n.text("%.1f h"), seconds / 3600)
     }
 }
 
diff --git a/Sources/DigUpApp/FolderChoices.swift b/Sources/DigUpApp/FolderChoices.swift
index 35f85ab6..1af8ac93 100644
--- a/Sources/DigUpApp/FolderChoices.swift
+++ b/Sources/DigUpApp/FolderChoices.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import Observation
@@ -89,8 +90,8 @@ final class FolderChoices {
                 expanded.insert(row.path)
             } else if selection.isSearched(path) {
                 let by = selection.searchedAs(path)
-                note = "“\(folder.lastPathComponent)” is searched already"
-                    + (by == nil || by == path ? "." : ", as part of “\((by! as NSString).lastPathComponent)”.")
+                note = L10n.format("“%1$@” is searched already", String(describing: folder.lastPathComponent))
+                    + (by == nil || by == path ? "." : L10n.format(", as part of “%1$@”.", String(describing: (by! as NSString).lastPathComponent)))
             } else {
                 rows.append(folder)
                 selection.setFolder(path, on: true)
@@ -116,7 +117,7 @@ final class FolderChoices {
                 selection.setSubfolder(path, on: false)
                 deeper.append(path)
             } else {
-                note = "“\(folder.lastPathComponent)” isn't searched anyway."
+                note = L10n.format("“%1$@” isn't searched anyway.", String(describing: folder.lastPathComponent))
             }
         }
         estimate(rows.filter { row in deeper.contains { FolderSelection.isInside($0, row.path) } })
@@ -267,10 +268,10 @@ private struct FolderRow: View {
     let row: URL
     @State private var showAll = false
 
-    static let laterHelp = "The first pass takes this long. Long PDFs and documents get their first pages in it, "
-        + "and the rest afterwards, once everything else is in."
-    static let codeHelp = "How long reading this code takes, once, and about how much room its index needs. After "
-        + "that, only what changes is read again."
+    static let laterHelp = L10n.text("The first pass takes this long. Long PDFs and documents get their first pages in it, ")
+        + L10n.text("and the rest afterwards, once everything else is in.")
+    static let codeHelp = L10n.text("How long reading this code takes, once, and about how much room its index needs. After ")
+        + L10n.text("that, only what changes is read again.")
 
     /// Subfolders shown before "Show N more".
     private static let shortList = 8
@@ -289,7 +290,7 @@ private struct FolderRow: View {
                         SubfolderRow(choices: choices, subfolder: subfolder)
                     }
                     if !showAll, subfolders.count > Self.shortList {
-                        Button("Show \(subfolders.count - Self.shortList) more") { showAll = true }
+                        Button(L10n.format("Show %1$@ more", String(describing: subfolders.count - Self.shortList))) { showAll = true }
                             .buttonStyle(.link)
                             .font(.system(size: 11))
                             .frame(maxWidth: .infinity, alignment: .leading)
@@ -326,9 +327,9 @@ private struct FolderRow: View {
             .buttonStyle(.plain)
             .opacity(canOpen ? 1 : 0)
             .disabled(!canOpen)
-            .help(open ? "Hide its subfolders" : "Choose among its subfolders")
-            .accessibilityLabel(open ? "Hide the subfolders of \(row.lastPathComponent)"
-                                : "Show the subfolders of \(row.lastPathComponent)")
+            .help(open ? L10n.text("Hide its subfolders") : L10n.text("Choose among its subfolders"))
+            .accessibilityLabel(open ? L10n.format("Hide the subfolders of %1$@", String(describing: row.lastPathComponent))
+                                : L10n.format("Show the subfolders of %1$@", String(describing: row.lastPathComponent)))
             Checkbox(mark: mark, label: row.lastPathComponent) { choices.toggle(row) }
             Image(nsImage: NSWorkspace.shared.icon(forFile: row.path))
                 .resizable()
@@ -336,15 +337,15 @@ private struct FolderRow: View {
             VStack(alignment: .leading, spacing: 3) {
                 Text(row.lastPathComponent).font(.system(size: 13, weight: .semibold))
                 if let estimate, estimate.failed {
-                    Text("Couldn't look inside it; it can still be searched.")
+                    Text(L10n.text("Couldn't look inside it; it can still be searched."))
                         .font(.system(size: 11))
                         .foregroundStyle(.secondary)
                 } else if let estimate, !estimate.readable {
                     HStack(spacing: 6) {
-                        Text("macOS isn't letting DigUp read it.")
+                        Text(L10n.text("macOS isn't letting DigUp read it."))
                             .font(.system(size: 11))
                             .foregroundStyle(.orange)
-                        Button("Allow in Settings…", action: openFolderPrivacySettings)
+                        Button(L10n.text("Allow in Settings…"), action: openFolderPrivacySettings)
                             .buttonStyle(.link)
                             .font(.system(size: 11))
                     }
@@ -352,8 +353,8 @@ private struct FolderRow: View {
                     KindCounts(counts: part.files)
                 } else {
                     Text(estimate == nil ? tildePath(row.path)
-                         : estimate!.files.isEmpty ? (choices.code ? "No code here" : "Nothing to search here yet")
-                         : "Nothing to search in the subfolders checked")
+                         : estimate!.files.isEmpty ? (choices.code ? L10n.text("No code here") : L10n.text("Nothing to search here yet"))
+                         : L10n.text("Nothing to search in the subfolders checked"))
                         .font(.system(size: 11))
                         .foregroundStyle(.secondary)
                         .lineLimit(1)
@@ -371,7 +372,7 @@ private struct FolderRow: View {
                             .font(.system(size: 10).monospacedDigit())
                             .foregroundStyle(.tertiary)
                     } else if let later = part?.later, later >= 30 {
-                        Text("+ \(roughDuration(later)) later")
+                        Text(L10n.format("+ %1$@ later", String(describing: roughDuration(later))))
                             .font(.system(size: 10).monospacedDigit())
                             .foregroundStyle(.tertiary)
                     }
@@ -413,7 +414,7 @@ private struct SubfolderRow: View {
             Spacer(minLength: 8)
             Text(approximately(subfolder.seconds)
                  + (choices.code ? " · \(roughBytes(subfolder.bytes))"
-                    : subfolder.laterSeconds >= 30 ? " + \(roughDuration(subfolder.laterSeconds)) later" : ""))
+                    : subfolder.laterSeconds >= 30 ? L10n.format(" + %1$@ later", String(describing: roughDuration(subfolder.laterSeconds))) : ""))
                 .font(.system(size: 11, weight: .medium).monospacedDigit())
                 .foregroundStyle(on ? .secondary : .tertiary)
                 .help(choices.code ? FolderRow.codeHelp : FolderRow.laterHelp)
diff --git a/Sources/DigUpApp/Hotkey.swift b/Sources/DigUpApp/Hotkey.swift
index 22f29fec..6749f1b0 100644
--- a/Sources/DigUpApp/Hotkey.swift
+++ b/Sources/DigUpApp/Hotkey.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import Carbon.HIToolbox
 
@@ -105,13 +106,13 @@ nonisolated struct KeyCombo: Equatable, Sendable {
         }
         guard taken else { return nil }
         switch (Int(keyCode), Int(carbonModifiers)) {
-        case (kVK_Space, cmdKey): return "Spotlight uses \(display)"
-        case (kVK_Space, cmdKey | optionKey): return "Finder's search window uses \(display)"
-        case (kVK_Space, controlKey), (kVK_Space, controlKey | optionKey): return "Switching input sources uses \(display)"
-        case (kVK_Space, controlKey | cmdKey): return "The emoji picker uses \(display)"
+        case (kVK_Space, cmdKey): return L10n.format("Spotlight uses %1$@", String(describing: display))
+        case (kVK_Space, cmdKey | optionKey): return L10n.format("Finder's search window uses %1$@", String(describing: display))
+        case (kVK_Space, controlKey), (kVK_Space, controlKey | optionKey): return L10n.format("Switching input sources uses %1$@", String(describing: display))
+        case (kVK_Space, controlKey | cmdKey): return L10n.format("The emoji picker uses %1$@", String(describing: display))
         case (kVK_ANSI_3, cmdKey | shiftKey), (kVK_ANSI_4, cmdKey | shiftKey), (kVK_ANSI_5, cmdKey | shiftKey):
-            return "Screenshots use \(display)"
-        default: return "macOS uses \(display) for one of its shortcuts"
+            return L10n.format("Screenshots use %1$@", String(describing: display))
+        default: return L10n.format("macOS uses %1$@ for one of its shortcuts", String(describing: display))
         }
     }
 }
diff --git a/Sources/DigUpApp/ModelDownload.swift b/Sources/DigUpApp/ModelDownload.swift
index ecc071c6..94db2d8e 100644
--- a/Sources/DigUpApp/ModelDownload.swift
+++ b/Sources/DigUpApp/ModelDownload.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import Foundation
@@ -69,15 +70,15 @@ final class ModelDownload {
     /// "42% · about 1 min left", "Checking the download…", "Waiting for the network…"
     var progressText: String {
         switch phase {
-        case .needed: return "Not downloaded yet"
+        case .needed: return L10n.text("Not downloaded yet")
         case .downloading:
             let percent = "\(Int((fraction * 100).rounded(.down)))%"
             guard let left = secondsLeft else { return percent }
-            return percent + " · " + (left < 50 ? "less than a minute left" : "about \(roughDuration(left)) left")
-        case .verifying: return "Checking the download…"
-        case .retrying: return "Waiting for the network…"
+            return percent + " · " + (left < 50 ? L10n.text("less than a minute left") : L10n.format("about %1$@ left", String(describing: roughDuration(left))))
+        case .verifying: return L10n.text("Checking the download…")
+        case .retrying: return L10n.text("Waiting for the network…")
         case .failed(let message): return message
-        case .ready: return "Ready"
+        case .ready: return L10n.text("Ready")
         }
     }
 
@@ -108,13 +109,13 @@ final class ModelDownload {
             var folder = self.folder
             try folder.setResourceValues(values)
         } catch {
-            phase = .failed("Can't create \(tildePath(folder.path))")
+            phase = .failed(L10n.format("Can't create %1$@", String(describing: tildePath(folder.path))))
             log("model: can't create \(folder.path): \(error)")
             return
         }
         let needed = ModelFiles.missing(in: folder).reduce(0) { $0 + $1.bytes } - partialBytes(of: file) + 200_000_000
         if let free = freeSpace(), free < needed {
-            phase = .failed("Needs \(bytes(needed)) free on this disk")
+            phase = .failed(L10n.format("Needs %1$@ free on this disk", String(describing: bytes(needed))))
             log("model: needs \(bytes(needed)) free, \(bytes(free)) is free")
             return
         }
@@ -158,7 +159,7 @@ final class ModelDownload {
         }, waiting: { [weak self] in
             DispatchQueue.main.async { [weak self] in
                 guard let self, attempt == current else { return }
-                phase = .retrying("Waiting for a network connection")
+                phase = .retrying(L10n.text("Waiting for a network connection"))
                 log("model: waiting for a network connection")
             }
         }, done: { [weak self] outcome in
@@ -214,12 +215,12 @@ final class ModelDownload {
                         next()
                     } else if chosen.remove(file.name) != nil {
                         // Chosen by hand: say so, rather than download what the network may block.
-                        phase = .failed("The chosen \(file.name) isn't the right file")
+                        phase = .failed(L10n.format("The chosen %1$@ isn't the right file", file.name))
                     } else {
                         failedChecks += 1
                         received = bytesOnDisk()
                         if failedChecks >= 2 {
-                            phase = .failed("The download was damaged twice. Try again later.")
+                            phase = .failed(L10n.text("The download was damaged twice. Try again later."))
                         } else {
                             next()
                         }
@@ -257,12 +258,12 @@ final class ModelDownload {
     /// afterwards downloads as usual.
     func use(_ urls: [URL]) {
         var picked: [(file: ModelFiles.File, url: URL)] = []
-        var problem = "Those aren't the model's files"
+        var problem = L10n.text("Those aren't the model's files")
         for url in urls {
             let size = FileFetcher.size(of: url)
             guard let file = ModelFiles.all.first(where: { $0.bytes == size }) else {
                 if let named = ModelFiles.all.first(where: { $0.name == url.lastPathComponent }) {
-                    problem = "The chosen \(named.name) is \(bytes(size)), not \(bytes(named.bytes))"
+                    problem = L10n.format("The chosen %1$@ is %2$@, not %3$@", named.name, bytes(size), bytes(named.bytes))
                 }
                 continue
             }
@@ -304,9 +305,8 @@ final class ModelDownload {
         panel.canChooseFiles = true
         panel.canChooseDirectories = false
         panel.allowsMultipleSelection = true
-        panel.prompt = "Use"
-        panel.message = "Choose the model files you downloaded: "
-            + ModelFiles.all.map(\.name).joined(separator: " and ") + "."
+        panel.prompt = L10n.text("Use")
+        panel.message = L10n.format("Choose the model files you downloaded: %1$@.", ModelFiles.all.map(\.name).joined(separator: L10n.text(" and ")))
         let finish = { [weak self] (response: NSApplication.ModalResponse) in
             guard response == .OK else { return }
             self?.use(panel.urls)
@@ -355,4 +355,3 @@ final class ModelDownload {
 nonisolated func bytes(_ count: Int64) -> String {
     ByteCountFormatter.string(fromByteCount: count, countStyle: .file)
 }
-
diff --git a/Sources/DigUpApp/Moments.swift b/Sources/DigUpApp/Moments.swift
index 16a149f3..d58d6fd9 100644
--- a/Sources/DigUpApp/Moments.swift
+++ b/Sources/DigUpApp/Moments.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AVFoundation
 import AVKit
 import AppKit
@@ -43,9 +44,9 @@ extension ResultRow {
     /// opens with your words in Preview's search, but Preview doesn't go to the page by itself. Code opens in the
     /// editor chosen for it: "Open in Zed".
     var openTitle: String {
-        if kind == .code, !CodeEditor.current.id.isEmpty { return "Open in \(CodeEditor.current.name)" }
-        if let moment, moment >= 1, Opener.jumpsToMoments(url) { return "Open at \(Self.clock(moment))" }
-        return "Open"
+        if kind == .code, !CodeEditor.current.id.isEmpty { return L10n.format("Open in %1$@", String(describing: CodeEditor.current.name)) }
+        if let moment, moment >= 1, Opener.jumpsToMoments(url) { return L10n.format("Open at %1$@", String(describing: Self.clock(moment))) }
+        return L10n.text("Open")
     }
 
     /// The line a code result opens at: where the name is defined or the query's words are, else where its stretch
diff --git a/Sources/DigUpApp/Onboarding.swift b/Sources/DigUpApp/Onboarding.swift
index 548eecb0..4a88550d 100644
--- a/Sources/DigUpApp/Onboarding.swift
+++ b/Sources/DigUpApp/Onboarding.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import Observation
@@ -35,7 +36,7 @@ final class OnboardingController: NSObject, NSWindowDelegate {
         window.titlebarAppearsTransparent = true
         window.titleVisibility = .hidden
         window.isMovableByWindowBackground = true
-        window.title = "Welcome to DigUp"
+        window.title = L10n.text("Welcome to DigUp")
         window.isReleasedWhenClosed = false
         window.delegate = self
         state.close = { [weak self] in self?.close() }
@@ -190,7 +191,7 @@ final class OnboardingState {
     }
 
     func skipFolders(from window: NSWindow?) {
-        app.pickFolders(for: window, prompt: "Skip") { [weak self] picked in
+        app.pickFolders(for: window, prompt: L10n.text("Skip")) { [weak self] picked in
             guard !picked.isEmpty else { return }
             self?.folders.skip(picked)
         }
@@ -260,7 +261,7 @@ struct OnboardingView: View {
                     .lineLimit(1)
             }
             if state.step != .welcome, state.step != .ready {
-                Button("Back") { state.back() }
+                Button(L10n.text("Back")) { state.back() }
             }
             Button(continueTitle) { state.next() }
                 .keyboardShortcut(.defaultAction)
@@ -273,26 +274,26 @@ struct OnboardingView: View {
 
     private var continueTitle: String {
         switch state.step {
-        case .welcome: "Get Started"
-        case .folders: "Continue"
-        case .code: "Continue"
-        case .shortcut: "Continue"
-        case .ready: "Done"
+        case .welcome: L10n.text("Get Started")
+        case .folders: L10n.text("Continue")
+        case .code: L10n.text("Continue")
+        case .shortcut: L10n.text("Continue")
+        case .ready: L10n.text("Done")
         }
     }
 
     private var codeSummary: String {
-        guard !state.codeFolders.roots.isEmpty else { return "Check the folders with your code" }
-        guard state.codeFolders.estimatesDone else { return "Looking at your code…" }
+        guard !state.codeFolders.roots.isEmpty else { return L10n.text("Check the folders with your code") }
+        guard state.codeFolders.estimatesDone else { return L10n.text("Looking at your code…") }
         let seconds = state.codeFolders.totalSeconds
-        return (seconds < 1 ? "Under a second" : "About \(roughDuration(seconds))")
+        return (seconds < 1 ? L10n.text("Under a second") : L10n.format("About %1$@", String(describing: roughDuration(seconds))))
             + ", \(roughBytes(state.codeFolders.totalBytes))"
     }
 
     private var foldersSummary: String {
-        guard !state.folders.roots.isEmpty else { return "Choose at least one folder" }
-        guard state.folders.estimatesDone else { return "Looking at your folders…" }
-        return "First pass: about \(roughDuration(state.folders.totalSeconds))"
+        guard !state.folders.roots.isEmpty else { return L10n.text("Choose at least one folder") }
+        guard state.folders.estimatesDone else { return L10n.text("Looking at your folders…") }
+        return L10n.format("First pass: about %1$@", String(describing: roughDuration(state.folders.totalSeconds)))
     }
 }
 
@@ -309,7 +310,7 @@ private struct StepDots: View {
             }
         }
         .accessibilityElement(children: .ignore)
-        .accessibilityLabel("Step \(current + 1) of \(count)")
+        .accessibilityLabel(L10n.format("Step %1$@ of %2$@", String(describing: current + 1), String(describing: count)))
     }
 }
 
@@ -322,23 +323,23 @@ struct DownloadStatus: View {
             switch download.phase {
             case .ready:
                 Image(systemName: "checkmark.circle.fill").foregroundStyle(.green)
-                Text("Model ready")
+                Text(L10n.text("Model ready"))
             case .failed(let message):
                 Image(systemName: "exclamationmark.triangle.fill").foregroundStyle(.orange)
                 Text(message).lineLimit(1)
-                Button("Try Again") { download.start() }.controlSize(.small)
-                Button("Use Files…") { download.chooseFiles(for: NSApp.keyWindow) }
+                Button(L10n.text("Try Again")) { download.start() }.controlSize(.small)
+                Button(L10n.text("Use Files…")) { download.chooseFiles(for: NSApp.keyWindow) }
                     .controlSize(.small)
-                    .help("Downloaded the model's two files somewhere else? Choose them here.")
+                    .help(L10n.text("Downloaded the model's two files somewhere else? Choose them here."))
             case .needed:
                 Image(systemName: "arrow.down.circle").foregroundStyle(.secondary)
-                Text("Model not downloaded")
-                Button("Download") { download.start() }.controlSize(.small)
+                Text(L10n.text("Model not downloaded"))
+                Button(L10n.text("Download")) { download.start() }.controlSize(.small)
             default:
                 ProgressView(value: download.fraction)
                     .progressViewStyle(.circular)
                     .controlSize(.small)
-                Text("Downloading the model · \(download.progressText)")
+                Text(L10n.format("Downloading the model · %1$@", String(describing: download.progressText)))
                     .lineLimit(1)
             }
         }
@@ -357,17 +358,17 @@ private struct WelcomeStep: View {
             Text("DigUp")
                 .font(.system(size: 30, weight: .bold))
                 .padding(.top, 10)
-            Text("Describe it. Dig it up.")
+            Text(L10n.text("Describe it. Dig it up."))
                 .font(.system(size: 16))
                 .foregroundStyle(.secondary)
                 .padding(.top, 2)
             VStack(alignment: .leading, spacing: 16) {
-                Feature(symbol: "camera.viewfinder", title: "Screenshots and photos",
-                        example: "“that payment error”, “the zebra”, “whiteboard from Tuesday”")
-                Feature(symbol: "doc.text", title: "PDFs and documents",
-                        example: "“the clause about pets in the lease”, “flight receipt”")
-                Feature(symbol: "waveform", title: "Moments inside audio and video",
-                        example: "“where they talk about sleep”, “the part with the drums”")
+                Feature(symbol: "camera.viewfinder", title: L10n.text("Screenshots and photos"),
+                        example: L10n.text("“that payment error”, “the zebra”, “whiteboard from Tuesday”"))
+                Feature(symbol: "doc.text", title: L10n.text("PDFs and documents"),
+                        example: L10n.text("“the clause about pets in the lease”, “flight receipt”"))
+                Feature(symbol: "waveform", title: L10n.text("Moments inside audio and video"),
+                        example: L10n.text("“where they talk about sleep”, “the part with the drums”"))
             }
             .padding(.top, 30)
             HStack(alignment: .top, spacing: 12) {
@@ -375,8 +376,8 @@ private struct WelcomeStep: View {
                     .font(.system(size: 18))
                     .foregroundStyle(.secondary)
                     .frame(width: 30)
-                Text("Everything is indexed and searched on this Mac. DigUp downloads its AI model (865 MB) once; "
-                     + "after that it works offline, and nothing you index ever leaves your Mac.")
+                Text(L10n.text("Everything is indexed and searched on this Mac. DigUp downloads its AI model (865 MB) once; ")
+                     + L10n.text("after that it works offline, and nothing you index ever leaves your Mac."))
                     .font(.system(size: 12))
                     .foregroundStyle(.secondary)
                     .fixedSize(horizontal: false, vertical: true)
@@ -431,12 +432,12 @@ private struct FoldersStep: View {
 
     var body: some View {
         VStack(alignment: .leading, spacing: 18) {
-            StepTitle(title: "What should DigUp search?",
-                      subtitle: "Pick folders, or open one to pick some of its subfolders. You can change this "
-                          + "anytime in Settings.")
+            StepTitle(title: L10n.text("What should DigUp search?"),
+                      subtitle: L10n.text("Pick folders, or open one to pick some of its subfolders. You can change this ")
+                          + L10n.text("anytime in Settings."))
             ScrollView {
                 VStack(spacing: 6) {
-                    FolderList(choices: state.folders, addTitle: "Add Folder…") {
+                    FolderList(choices: state.folders, addTitle: L10n.text("Add Folder…")) {
                         state.addFolders(from: NSApp.keyWindow)
                     }
                     SkipChoices(state: state)
@@ -445,8 +446,8 @@ private struct FoldersStep: View {
             .scrollBounceBehavior(.basedOnSize)
             HStack(alignment: .top, spacing: 8) {
                 Image(systemName: "info.circle").foregroundStyle(.secondary)
-                Text("macOS will ask before DigUp can read folders like Desktop, Documents and Downloads. "
-                     + "DigUp only reads files: it never changes, moves or uploads them.")
+                Text(L10n.text("macOS will ask before DigUp can read folders like Desktop, Documents and Downloads. ")
+                     + L10n.text("DigUp only reads files: it never changes, moves or uploads them."))
                     .fixedSize(horizontal: false, vertical: true)
             }
             .font(.system(size: 11))
@@ -477,25 +478,25 @@ private struct SkipChoices: View {
                             Image(systemName: "minus.circle.fill").foregroundStyle(.secondary)
                         }
                         .buttonStyle(.plain)
-                        .help("Search this folder again")
+                        .help(L10n.text("Search this folder again"))
                     }
                     .font(.system(size: 12))
                 }
                 Button {
                     state.skipFolders(from: NSApp.keyWindow)
                 } label: {
-                    Label("Skip a Folder…", systemImage: "plus")
+                    Label(L10n.text("Skip a Folder…"), systemImage: "plus")
                 }
                 .controlSize(.small)
                 HStack(spacing: 8) {
-                    Text("File types")
-                    TextField("Extensions", text: $state.skippedTypesText, prompt: Text("e.g. heic, txt"))
+                    Text(L10n.text("File types"))
+                    TextField(L10n.text("Extensions"), text: $state.skippedTypesText, prompt: Text(L10n.text("e.g. heic, txt")))
                         .labelsHidden()
                         .controlSize(.small)
                         .onSubmit { state.folders.setTypes(state.skippedTypesText) }
                 }
                 .font(.system(size: 12))
-                Text("Code, keys, certificates, hidden folders, app bundles and caches are always skipped.")
+                Text(L10n.text("Code, keys, certificates, hidden folders, app bundles and caches are always skipped."))
                     .font(.system(size: 11))
                     .foregroundStyle(.secondary)
                     .fixedSize(horizontal: false, vertical: true)
@@ -503,7 +504,7 @@ private struct SkipChoices: View {
             .padding(.top, 8)
             .padding(.leading, 4)
         } label: {
-            Text("Skip some folders or file types")
+            Text(L10n.text("Skip some folders or file types"))
                 .font(.system(size: 12, weight: .medium))
                 .foregroundStyle(.secondary)
         }
@@ -522,17 +523,17 @@ private struct CodeStep: View {
 
     var body: some View {
         VStack(alignment: .leading, spacing: 16) {
-            StepTitle(title: "Search your code too?",
-                      subtitle: "DigUp can find code by what it does: type code: in the search panel, as in "
-                          + "“code: retry with backoff”. It gets an index of its own and never shows up in other "
-                          + "searches. You can turn it on later in Settings → Code.")
-            SwitchRow(title: "Search my code", detail: "Off unless you turn it on.", isOn: $state.searchCode)
+            StepTitle(title: L10n.text("Search your code too?"),
+                      subtitle: L10n.text("DigUp can find code by what it does: type code: in the search panel, as in ")
+                          + L10n.text("“code: retry with backoff”. It gets an index of its own and never shows up in other ")
+                          + L10n.text("searches. You can turn it on later in Settings → Code."))
+            SwitchRow(title: L10n.text("Search my code"), detail: L10n.text("Off unless you turn it on."), isOn: $state.searchCode)
                 .padding(14)
                 .background(RoundedRectangle(cornerRadius: 10, style: .continuous).fill(Color.primary.opacity(0.04)))
             if state.searchCode {
                 ScrollView {
                     VStack(spacing: 6) {
-                        FolderList(choices: state.codeFolders, addTitle: "Add Folder…") {
+                        FolderList(choices: state.codeFolders, addTitle: L10n.text("Add Folder…")) {
                             state.addCodeFolders(from: NSApp.keyWindow)
                         }
                         CodeFolderNote().padding(.top, 4)
@@ -540,8 +541,8 @@ private struct CodeStep: View {
                 }
                 .scrollBounceBehavior(.basedOnSize)
                 HStack {
-                    Text("Open code in")
-                    Picker("Open code in", selection: Binding(get: { CodeEditor.current.id },
+                    Text(L10n.text("Open code in"))
+                    Picker(L10n.text("Open code in"), selection: Binding(get: { CodeEditor.current.id },
                                                               set: { state.app.setCodeEditor($0) })) {
                         ForEach(CodeEditor.installed) { editor in Text(editor.name).tag(editor.id) }
                         Text(CodeEditor.defaultApp.name).tag(CodeEditor.defaultApp.id)
@@ -563,17 +564,17 @@ private struct ShortcutStep: View {
 
     var body: some View {
         VStack(spacing: 0) {
-            StepTitle(title: "Open DigUp from anywhere",
-                      subtitle: "Press the shortcut in any app, describe what you're looking for, and press Return.")
+            StepTitle(title: L10n.text("Open DigUp from anywhere"),
+                      subtitle: L10n.text("Press the shortcut in any app, describe what you're looking for, and press Return."))
             ShortcutRecorder(combo: state.model.hotkey, apply: { state.app.setHotkey($0) },
                              listening: { state.app.hotkeyRecording($0) }, capSize: 20)
                 .padding(.top, 34)
             Group {
                 if state.hotkeyWorked {
-                    Label("That's it. It works from any app.", systemImage: "checkmark.circle.fill")
+                    Label(L10n.text("That's it. It works from any app."), systemImage: "checkmark.circle.fill")
                         .foregroundStyle(.green)
                 } else if let hotkey = state.model.hotkey {
-                    Text("Try it now: press \(hotkey.display).")
+                    Text(L10n.format("Try it now: press %1$@.", String(describing: hotkey.display)))
                         .foregroundStyle(.secondary)
                 }
             }
@@ -581,15 +582,15 @@ private struct ShortcutStep: View {
             .padding(.top, 16)
             .animation(.default, value: state.hotkeyWorked)
             VStack(alignment: .leading, spacing: 9) {
-                Text("IN THE SEARCH PANEL")
+                Text(L10n.text("IN THE SEARCH PANEL"))
                     .font(.system(size: 10, weight: .semibold))
                     .tracking(0.6)
                     .foregroundStyle(.secondary)
-                KeyTip(caps: ["↩"], text: "Open the file")
-                KeyTip(caps: ["⌘", "↩"], text: "Show it in Finder")
-                KeyTip(caps: ["Space"], text: "Quick Look, after arrowing to a result")
-                KeyTip(caps: ["⌘", "C"], text: "Copy the file, to paste anywhere")
-                KeyTip(caps: ["esc"], text: "Close")
+                KeyTip(caps: ["↩"], text: L10n.text("Open the file"))
+                KeyTip(caps: ["⌘", "↩"], text: L10n.text("Show it in Finder"))
+                KeyTip(caps: ["Space"], text: L10n.text("Quick Look, after arrowing to a result"))
+                KeyTip(caps: ["⌘", "C"], text: L10n.text("Copy the file, to paste anywhere"))
+                KeyTip(caps: ["esc"], text: L10n.text("Close"))
             }
             .padding(18)
             .frame(maxWidth: 340, alignment: .leading)
@@ -621,7 +622,7 @@ private struct ReadyStep: View {
                 .font(.system(size: 60))
                 .foregroundStyle(Brand.gradient)
                 .padding(.top, 8)
-            Text("You're all set")
+            Text(L10n.text("You're all set"))
                 .font(.system(size: 26, weight: .bold))
                 .padding(.top, 14)
             Text(progressNote)
@@ -632,7 +633,7 @@ private struct ReadyStep: View {
                 .frame(maxWidth: 470)
                 .padding(.top, 8)
             VStack(alignment: .leading, spacing: 16) {
-                SwitchRow(title: "Open DigUp when you log in", detail: "So the shortcut always works.",
+                SwitchRow(title: L10n.text("Open DigUp when you log in"), detail: L10n.text("So the shortcut always works."),
                           isOn: $state.launchAtLogin)
                 Divider()
                 SwitchRow(title: AppSettings.batteryTitle, detail: AppSettings.batteryDetail,
@@ -644,7 +645,7 @@ private struct ReadyStep: View {
             .padding(.top, 28)
             HStack(spacing: 8) {
                 Image(systemName: "sparkle.magnifyingglass")
-                Text("DigUp lives in the menu bar, which shows how indexing is going.")
+                Text(L10n.text("DigUp lives in the menu bar, which shows how indexing is going."))
             }
             .font(.system(size: 12))
             .foregroundStyle(.secondary)
@@ -655,15 +656,15 @@ private struct ReadyStep: View {
 
     private var progressNote: String {
         let seconds = state.folders.totalSeconds, later = state.folders.totalLaterSeconds
-        let time = seconds > 0 ? " (about \(roughDuration(seconds)) on this Mac)" : ""
-        let rest = later >= 30 ? " Long PDFs and documents get their first pages in that time, and the rest "
-            + "afterwards (about \(roughDuration(later)) more)." : ""
+        let time = seconds > 0 ? L10n.format(" (about %1$@ on this Mac)", String(describing: roughDuration(seconds))) : ""
+        let rest = later >= 30 ? L10n.text(" Long PDFs and documents get their first pages in that time, and the rest ")
+            + L10n.format("afterwards (about %1$@ more).", String(describing: roughDuration(later))) : ""
         if state.download.isReady {
-            return "DigUp is reading your folders\(time), newest files first. You can search right away; "
-                + "results fill in as it goes." + rest
+            return L10n.format("DigUp is reading your folders%1$@, newest files first. You can search right away; ", String(describing: time))
+                + L10n.text("results fill in as it goes.") + rest
         }
-        return "DigUp starts reading your folders\(time) once the model has downloaded "
-            + "(\(state.download.progressText)). Until then, search finds files by name." + rest
+        return L10n.format("DigUp starts reading your folders%1$@ once the model has downloaded ", String(describing: time))
+            + L10n.format("(%1$@). Until then, search finds files by name.", String(describing: state.download.progressText)) + rest
     }
 }
 
diff --git a/Sources/DigUpApp/PowerPolicy.swift b/Sources/DigUpApp/PowerPolicy.swift
index 67c239ba..e05a3685 100644
--- a/Sources/DigUpApp/PowerPolicy.swift
+++ b/Sources/DigUpApp/PowerPolicy.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import Foundation
 import IOKit.ps
 
@@ -53,12 +54,12 @@ final class PowerPolicy {
 
     nonisolated static func backfillBlocker(indexOnBattery: Bool) -> String? {
         let info = ProcessInfo.processInfo
-        if info.isLowPowerModeEnabled { return "Low Power Mode" }
+        if info.isLowPowerModeEnabled { return L10n.text("Low Power Mode") }
         switch info.thermalState {
-        case .serious, .critical: return "Mac is warm"
+        case .serious, .critical: return L10n.text("Mac is warm")
         default: break
         }
-        if !indexOnBattery, !onACPower() { return "on battery" }
+        if !indexOnBattery, !onACPower() { return L10n.text("on battery") }
         return nil
     }
 
diff --git a/Sources/DigUpApp/Previews.swift b/Sources/DigUpApp/Previews.swift
index 247abeeb..608a00c7 100644
--- a/Sources/DigUpApp/Previews.swift
+++ b/Sources/DigUpApp/Previews.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AVFoundation
 import AppKit
 import DigUpKit
@@ -145,7 +146,7 @@ struct PreviewPane: View {
                 .buttonStyle(.plain)
                 .font(.system(size: 11))
                 .foregroundStyle(.secondary)
-                .help("Show in Finder")
+                .help(L10n.text("Show in Finder"))
                 Text(row.details)
                     .font(.system(size: 11))
                     .foregroundStyle(.secondary)
@@ -170,7 +171,7 @@ struct PreviewActions: View {
         HStack(spacing: 8) {
             Button(row.openTitle, action: open)
                 .keyboardShortcut(.defaultAction)
-            Button("Show in Finder", action: reveal)
+            Button(L10n.text("Show in Finder"), action: reveal)
         }
         .controlSize(controlSize)
     }
@@ -288,7 +289,7 @@ struct AudioMoment: View {
                         .foregroundStyle(Color.accentColor)
                 }
                 .buttonStyle(.plain)
-                .help(row.loc.map { "Play from \(ResultRow.clock($0))" } ?? "Play")
+                .help(row.loc.map { L10n.format("Play from %1$@", String(describing: ResultRow.clock($0))) } ?? L10n.text("Play"))
             }
             if let loc = row.loc {
                 VStack(spacing: 5) {
@@ -297,7 +298,7 @@ struct AudioMoment: View {
                                   playhead: playback.isCurrent(row) ? playback.time : nil)
                             .frame(maxWidth: 260)
                     }
-                    Text(playback.isCurrent(row) ? "\(ResultRow.clock(playback.time)) – playing from "
+                    Text(playback.isCurrent(row) ? L10n.format("%1$@ – playing from ", String(describing: ResultRow.clock(playback.time)))
                          + ResultRow.clock(loc) : span(from: loc))
                         .font(.system(size: 11).monospacedDigit())
                         .foregroundStyle(.secondary)
@@ -311,7 +312,7 @@ struct AudioMoment: View {
     /// "0:25 – 0:55 of 3:12"
     private func span(from start: Double) -> String {
         let end = row.locEnd ?? start + 30
-        let total = row.duration.map { " of " + ResultRow.clock($0) } ?? ""
+        let total = row.duration.map { L10n.text(" of ") + ResultRow.clock($0) } ?? ""
         return ResultRow.clock(start) + " – " + ResultRow.clock(end) + total
     }
 }
@@ -356,8 +357,8 @@ struct PlayButton: View {
                 .overlay(Circle().strokeBorder(.white.opacity(0.7), lineWidth: 1.5))
         }
         .buttonStyle(.plain)
-        .help(row.moment.map { "Play from \(ResultRow.clock($0))" } ?? "Play")
-        .accessibilityLabel(row.moment.map { "Play from \(ResultRow.clock($0))" } ?? "Play")
+        .help(row.moment.map { L10n.format("Play from %1$@", String(describing: ResultRow.clock($0))) } ?? L10n.text("Play"))
+        .accessibilityLabel(row.moment.map { L10n.format("Play from %1$@", String(describing: ResultRow.clock($0))) } ?? L10n.text("Play"))
     }
 }
 
@@ -394,7 +395,7 @@ struct Passage: View {
         guard let part = row.loc.map(Int.init), let parts = row.info["chunks"].flatMap(Int.init), parts > 1 else {
             return nil
         }
-        return "Part \(part) of \(parts)"
+        return L10n.format("Part %1$@ of %2$@", String(describing: part), String(describing: parts))
     }
 
     /// Up to ~900 characters from just before the first marked word, the words marked like a search in Preview.
diff --git a/Sources/DigUpApp/Results.swift b/Sources/DigUpApp/Results.swift
index 55c3c13d..97236f14 100644
--- a/Sources/DigUpApp/Results.swift
+++ b/Sources/DigUpApp/Results.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 
@@ -69,7 +70,7 @@ struct ResultRow: Identifiable, Equatable {
     var place: String? {
         guard let loc else { return nil }
         switch segment {
-        case .page, .pageImage: return "p. \(Int(loc))"
+        case .page, .pageImage: return L10n.format("p. %1$@", String(describing: Int(loc)))
         case .frame: return Self.clock(loc)
         case .audio: return kind == .video ? "♪ \(Self.clock(loc))" : Self.clock(loc)
         case .lines: return Int(loc) == Int(locEnd ?? loc) ? "L\(Int(loc))" : "L\(Int(loc))–\(Int(locEnd ?? loc))"
@@ -83,8 +84,8 @@ struct ResultRow: Identifiable, Equatable {
         guard let loc else { return nil }
         let (first, last) = (Int(loc), Int(locEnd ?? loc))
         switch segment {
-        case .lines: return first == last ? "line \(first)" : "lines \(first)–\(last)"
-        case .cells: return first == last ? "cell \(first)" : "cells \(first)–\(last)"
+        case .lines: return first == last ? L10n.format("line %1$@", String(describing: first)) : L10n.format("lines %1$@–%2$@", String(describing: first), String(describing: last))
+        case .cells: return first == last ? L10n.format("cell %1$@", String(describing: first)) : L10n.format("cells %1$@–%2$@", String(describing: first), String(describing: last))
         default: return nil
         }
     }
@@ -96,19 +97,19 @@ struct ResultRow: Identifiable, Equatable {
 
     /// Why it's here, in a few words: "Matches the picture", "Matches the frame at 0:06".
     var reason: String {
-        guard matchedMeaning else { return matchedWords ? "Has your words" : "Matches its name" }
+        guard matchedMeaning else { return matchedWords ? L10n.text("Has your words") : L10n.text("Matches its name") }
         let place = loc.map(Self.clock) ?? ""
-        let page = loc.map { "page \(Int($0))" } ?? "a page"
+        let page = loc.map { L10n.format("page %1$@", String(describing: Int($0))) } ?? L10n.text("a page")
         switch segment {
-        case .image: return kind == .screenshot ? "Matches what's on screen" : "Matches the picture"
-        case .ocr: return "Matches the text in it"
-        case .frame: return "Matches the frame at \(place)"
-        case .audio: return kind == .video ? "Matches the sound at \(place)" : "Matches what's heard at \(place)"
-        case .page: return "Matches the text on \(page)"
-        case .pageImage: return "Matches \(page)"
-        case .chunk: return "Matches its text"
-        case .name: return "Matches its name"
-        case .lines, .cells: return "Matches \(span ?? "the code")"
+        case .image: return kind == .screenshot ? L10n.text("Matches what's on screen") : L10n.text("Matches the picture")
+        case .ocr: return L10n.text("Matches the text in it")
+        case .frame: return L10n.format("Matches the frame at %1$@", String(describing: place))
+        case .audio: return kind == .video ? L10n.format("Matches the sound at %1$@", String(describing: place)) : L10n.format("Matches what's heard at %1$@", String(describing: place))
+        case .page: return L10n.format("Matches the text on %1$@", String(describing: page))
+        case .pageImage: return L10n.format("Matches %1$@", String(describing: page))
+        case .chunk: return L10n.text("Matches its text")
+        case .name: return L10n.text("Matches its name")
+        case .lines, .cells: return L10n.format("Matches %1$@", String(describing: span ?? L10n.text("the code")))
         }
     }
 
@@ -118,9 +119,9 @@ struct ResultRow: Identifiable, Equatable {
         if kind == .code {
             var parts = [CodeExtractor.language(of: url.path)]
             if let cells = info["cells"].flatMap(Int.init) {
-                parts.append(cells == 1 ? "1 cell" : "\(cells) cells")
+                parts.append(cells == 1 ? L10n.text("1 cell") : L10n.format("%1$@ cells", String(describing: cells)))
             } else if let lines = info["lines"].flatMap(Int.init) {
-                parts.append(lines == 1 ? "1 line" : "\(lines.formatted()) lines")
+                parts.append(lines == 1 ? L10n.text("1 line") : L10n.format("%1$@ lines", String(describing: lines.formatted())))
             }
             parts.append(modified.formatted(date: .abbreviated, time: .omitted))
             if size > 0 { parts.append(bytes(size)) }
@@ -131,9 +132,9 @@ struct ResultRow: Identifiable, Equatable {
         // A long file still being read (`Indexer.finishLongFiles`): what isn't read yet can't match.
         let readTo = info["read_to"].flatMap(Int.init)
         if let pages = info["pages"].flatMap(Int.init) {
-            parts.append((pages == 1 ? "1 page" : "\(pages) pages") + (readTo.map { ", \($0) read so far" } ?? ""))
+            parts.append((pages == 1 ? L10n.text("1 page") : L10n.format("%1$@ pages", String(describing: pages))) + (readTo.map { L10n.format(", %1$@ read so far", String(describing: $0)) } ?? ""))
         } else if readTo != nil {
-            parts.append("partly read so far")
+            parts.append(L10n.text("partly read so far"))
         }
         if let duration { parts.append(Self.clock(duration)) }
         if size > 0 { parts.append(bytes(size)) }
@@ -169,12 +170,12 @@ enum ResultGroupKind: CaseIterable {
 
     var title: String {
         switch self {
-        case .screenshots: "Screenshots"
-        case .images: "Images"
-        case .documents: "Documents"
-        case .video: "Video"
-        case .audio: "Audio"
-        case .code: "Code"
+        case .screenshots: L10n.text("Screenshots")
+        case .images: L10n.text("Images")
+        case .documents: L10n.text("Documents")
+        case .video: L10n.text("Video")
+        case .audio: L10n.text("Audio")
+        case .code: L10n.text("Code")
         }
     }
 
@@ -246,13 +247,13 @@ struct ResultSet: Equatable {
 extension FileKind {
     var title: String {
         switch self {
-        case .screenshot: "Screenshot"
-        case .image: "Image"
+        case .screenshot: L10n.text("Screenshot")
+        case .image: L10n.text("Image")
         case .pdf: "PDF"
-        case .doc: "Document"
-        case .audio: "Audio"
-        case .video: "Video"
-        case .code: "Code"
+        case .doc: L10n.text("Document")
+        case .audio: L10n.text("Audio")
+        case .video: L10n.text("Video")
+        case .code: L10n.text("Code")
         }
     }
 
diff --git a/Sources/DigUpApp/SearchPanel.swift b/Sources/DigUpApp/SearchPanel.swift
index ce158d3e..fec995ba 100644
--- a/Sources/DigUpApp/SearchPanel.swift
+++ b/Sources/DigUpApp/SearchPanel.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import Observation
@@ -121,7 +122,7 @@ final class SearchPanelController {
         installKeyMonitor()
         if activity == nil {
             activity = ProcessInfo.processInfo.beginActivity(options: .userInitiatedAllowingIdleSystemSleep,
-                                                             reason: "Search panel open")
+                                                             reason: L10n.text("Search panel open"))
         }
         let shown = Date()
         DispatchQueue.main.async {
@@ -374,7 +375,7 @@ final class SearchPanelController {
         pasteboard.clearContents()
         // As a file, like ⌘C in Finder: paste into a folder, a chat or a mail.
         pasteboard.writeObjects([row.url as NSURL])
-        flash("Copied \(row.name)")
+        flash(L10n.format("Copied %1$@", String(describing: row.name)))
     }
 
     /// The search window, with this query (and only one kind, if given): for a bigger look.
diff --git a/Sources/DigUpApp/SearchPanelView.swift b/Sources/DigUpApp/SearchPanelView.swift
index 4d1d0d54..a81eb9ae 100644
--- a/Sources/DigUpApp/SearchPanelView.swift
+++ b/Sources/DigUpApp/SearchPanelView.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import SwiftUI
@@ -30,12 +31,12 @@ struct SearchPanelView: View {
                 .font(.system(size: controller.isCode ? 17 : 20, weight: .semibold))
                 .foregroundStyle(Brand.gradient)
                 .frame(width: 24)
-                .help(controller.isCode ? "Searching your code" : "")
+                .help(controller.isCode ? L10n.text("Searching your code") : "")
             // With code search on, one example is code's: nothing else in the panel shows "code:".
             SearchField(text: $controller.query, fontSize: 22,
                         placeholder: controller.model.hasCode
-                            ? "Describe it: “zebra in a video”, “code: retry with backoff”…"
-                            : "Describe it: “payment error screenshot”, “zebra in a video”…") {
+                            ? L10n.text("Describe it: “zebra in a video”, “code: retry with backoff”…")
+                            : L10n.text("Describe it: “payment error screenshot”, “zebra in a video”…")) {
                 controller.field = $0
             }
             if controller.phase == .words, controller.encoder == .starting {
@@ -61,18 +62,18 @@ struct SearchPanelView: View {
         } else if controller.results.isEmpty {
             VStack(spacing: 8) {
                 if controller.phase == .words {
-                    Text("Searching…").foregroundStyle(.secondary)
+                    Text(L10n.text("Searching…")).foregroundStyle(.secondary)
                 } else if !controller.model.hasFolders {
-                    Text("No folders chosen yet").font(.system(size: 15, weight: .semibold))
-                    Text("DigUp only searches the folders you pick.").foregroundStyle(.secondary)
-                    Button("Choose Folders…") { controller.chooseFolders() }
+                    Text(L10n.text("No folders chosen yet")).font(.system(size: 15, weight: .semibold))
+                    Text(L10n.text("DigUp only searches the folders you pick.")).foregroundStyle(.secondary)
+                    Button(L10n.text("Choose Folders…")) { controller.chooseFolders() }
                         .padding(.top, 4)
                 } else if controller.isCode {
-                    Text("No good matches in your code").font(.system(size: 15, weight: .semibold))
-                    Text("Try saying what the code does, or a name that's in it.").foregroundStyle(.secondary)
+                    Text(L10n.text("No good matches in your code")).font(.system(size: 15, weight: .semibold))
+                    Text(L10n.text("Try saying what the code does, or a name that's in it.")).foregroundStyle(.secondary)
                 } else {
-                    Text("No good matches").font(.system(size: 15, weight: .semibold))
-                    Text("Try what you'd see or hear in it, or words you remember from it.")
+                    Text(L10n.text("No good matches")).font(.system(size: 15, weight: .semibold))
+                    Text(L10n.text("Try what you'd see or hear in it, or words you remember from it."))
                         .foregroundStyle(.secondary)
                 }
             }
@@ -121,31 +122,31 @@ struct SearchPanelView: View {
     private var keysText: String {
         let row = controller.selectedRow
         if let row, row.kind == .code {
-            let line = row.segment == .lines ? " at line \(row.codeLine)" : ""
-            return "↩ \(row.openTitle)\(line)   ⌘↩ Reveal   ␣ Quick Look   ⌘C Copy"
+            let line = row.segment == .lines ? L10n.format(" at line %1$@", String(describing: row.codeLine)) : ""
+            return L10n.format("↩ %1$@%2$@   ⌘↩ Reveal   ␣ Quick Look   ⌘C Copy", String(describing: row.openTitle), String(describing: line))
         }
-        let place = row?.jump.map { " at \($0)" } ?? ""
-        return "↩ \(row?.openTitle ?? "Open")   ⌘↩ Reveal   ␣ Quick Look\(place)   ⌘C Copy"
+        let place = row?.jump.map { L10n.format(" at %1$@", String(describing: $0)) } ?? ""
+        return L10n.format("↩ %1$@   ⌘↩ Reveal   ␣ Quick Look%2$@   ⌘C Copy", String(describing: row?.openTitle ?? L10n.text("Open")), String(describing: place))
     }
 
     private var statusText: String {
         if let note = controller.note { return note }
         switch controller.phase {
         case .words:
-            return controller.encoder == .starting ? "Matching words; meaning search is warming up…" : "Matching words…"
+            return controller.encoder == .starting ? L10n.text("Matching words; meaning search is warming up…") : L10n.text("Matching words…")
         case .wordsOnly:
-            return controller.model.meaningUnavailable ?? "Words only: meaning search isn't available"
+            return controller.model.meaningUnavailable ?? L10n.text("Words only: meaning search isn't available")
         case .codeHint, .codeOff:
-            return controller.phase == .codeOff ? "Code search is off" : "Searching your code"
+            return controller.phase == .codeOff ? L10n.text("Code search is off") : L10n.text("Searching your code")
         case .meaning, .empty:
             if controller.isCode, let indexing = controller.model.status.code.indexing, indexing.total > 0 {
-                return "Still reading code (\(Int(Double(indexing.done) / Double(indexing.total) * 100))%): some isn't in yet"
+                return L10n.format("Still reading code (%1$@%%): some isn't in yet", String(describing: Int(Double(indexing.done) / Double(indexing.total) * 100)))
             }
             if !controller.isCode, let caveat = controller.model.resultsCaveat { return caveat }
             let count = controller.results.strongRows.count
             let weaker = controller.results.weaker.count
-            return (count == 1 ? "1 result" : "\(count) results") + (controller.isCode ? " in your code" : "")
-                + (weaker > 0 ? " · \(weaker) weaker" : "")
+            return (count == 1 ? L10n.text("1 result") : L10n.format("%1$@ results", String(describing: count))) + (controller.isCode ? L10n.text(" in your code") : "")
+                + (weaker > 0 ? L10n.format(" · %1$@ weaker", String(describing: weaker)) : "")
         }
     }
 }
@@ -173,14 +174,14 @@ private struct ResultList: View {
                             Button {
                                 controller.openInWindow(group.kind)
                             } label: {
-                                Text("Show all \(group.total) \(group.kind.title.lowercased())…")
+                                Text(L10n.format("Show all %1$@ %2$@…", String(describing: group.total), String(describing: group.kind.title.lowercased())))
                                     .font(.system(size: 11.5, weight: .medium))
                                     .foregroundStyle(Color.accentColor)
                                     .padding(.horizontal, 10)
                                     .padding(.vertical, 3)
                             }
                             .buttonStyle(.plain)
-                            .help("Open them in the DigUp window (⌘O shows everything)")
+                            .help(L10n.text("Open them in the DigUp window (⌘O shows everything)"))
                         }
                     }
                     if !controller.results.weaker.isEmpty {
@@ -284,7 +285,7 @@ private struct WeakerRow: View {
             Image(systemName: "chevron.right")
                 .font(.system(size: 9.5, weight: .bold))
                 .rotationEffect(.degrees(expanded ? 90 : 0))
-            Text(expanded ? "Weaker matches" : "\(count) weaker \(count == 1 ? "match" : "matches")")
+            Text(expanded ? L10n.text("Weaker matches") : L10n.format("%1$@ weaker %2$@", String(describing: count), String(describing: count == 1 ? "match" : "matches")))
                 .font(.system(size: 11.5, weight: .medium))
             Spacer()
         }
@@ -307,10 +308,10 @@ private struct WeakerExplainer: View {
             Image(systemName: "line.3.horizontal.decrease.circle")
                 .font(.system(size: 30, weight: .light))
                 .foregroundStyle(.tertiary)
-            Text(expanded ? "Weaker matches" : "\(count) weaker \(count == 1 ? "match" : "matches")")
+            Text(expanded ? L10n.text("Weaker matches") : L10n.format("%1$@ weaker %2$@", String(describing: count), String(describing: count == 1 ? "match" : "matches")))
                 .font(.system(size: 14, weight: .semibold))
-            Text("They match much less well than the results above. Press Return to "
-                 + (expanded ? "fold them away." : "show them."))
+            Text(L10n.text("They match much less well than the results above. Press Return to ")
+                 + (expanded ? L10n.text("fold them away.") : L10n.text("show them.")))
                 .font(.system(size: 12))
                 .foregroundStyle(.secondary)
                 .multilineTextAlignment(.center)
@@ -376,7 +377,7 @@ struct SearchField: NSViewRepresentable {
         field.cell?.isScrollable = true
         field.cell?.wraps = false
         field.delegate = context.coordinator
-        field.setAccessibilityLabel("Search")
+        field.setAccessibilityLabel(L10n.text("Search"))
         onMake(field)
         return field
     }
@@ -429,7 +430,7 @@ final class FocusReportingField: NSTextField {
 struct FileDragArea: NSViewRepresentable {
     let url: URL
     /// "Open at 0:06": what double-click and the menu's first item do.
-    var openTitle = "Open"
+    var openTitle = L10n.text("Open")
     let onClick: () -> Void
     let onOpen: () -> Void
 
@@ -445,7 +446,7 @@ struct FileDragArea: NSViewRepresentable {
 
 final class FileDragView: NSView, NSDraggingSource {
     var url: URL?
-    var openTitle = "Open"
+    var openTitle = L10n.text("Open")
     var onClick: () -> Void = {}
     var onOpen: () -> Void = {}
     private var mouseDownEvent: NSEvent?
@@ -487,13 +488,13 @@ final class FileDragView: NSView, NSDraggingSource {
         onClick()
         let menu = NSMenu()
         menu.addItem(ActionMenuItem(openTitle) { [onOpen] in onOpen() })
-        menu.addItem(ActionMenuItem("Show in Finder") { NSWorkspace.shared.activateFileViewerSelecting([url]) })
+        menu.addItem(ActionMenuItem(L10n.text("Show in Finder")) { NSWorkspace.shared.activateFileViewerSelecting([url]) })
         menu.addItem(.separator())
-        menu.addItem(ActionMenuItem("Copy") {
+        menu.addItem(ActionMenuItem(L10n.text("Copy")) {
             NSPasteboard.general.clearContents()
             NSPasteboard.general.writeObjects([url as NSURL])
         })
-        menu.addItem(ActionMenuItem("Copy Path") {
+        menu.addItem(ActionMenuItem(L10n.text("Copy Path")) {
             NSPasteboard.general.clearContents()
             NSPasteboard.general.setString(url.path, forType: .string)
         })
@@ -511,8 +512,8 @@ final class FileDragView: NSView, NSDraggingSource {
 private struct CodeHint: View {
     let controller: SearchPanelController
 
-    static let examples = ["code: retry a request with backoff", "code: where the settings are saved",
-                           "code: parse the command line options"]
+    static let examples = [L10n.text("code: retry a request with backoff"), L10n.text("code: where the settings are saved"),
+                           L10n.text("code: parse the command line options")]
 
     var body: some View {
         VStack(spacing: 10) {
@@ -520,17 +521,17 @@ private struct CodeHint: View {
                 .font(.system(size: 26, weight: .medium))
                 .foregroundStyle(Brand.gradient)
             if controller.phase == .codeOff {
-                Text("Code search is off").font(.system(size: 15, weight: .semibold))
-                Text("DigUp can find code by what it does, in the folders you pick. Code gets an index of its own "
-                     + "and never shows up in other searches.")
+                Text(L10n.text("Code search is off")).font(.system(size: 15, weight: .semibold))
+                Text(L10n.text("DigUp can find code by what it does, in the folders you pick. Code gets an index of its own ")
+                     + L10n.text("and never shows up in other searches."))
                     .foregroundStyle(.secondary)
                     .multilineTextAlignment(.center)
                     .frame(maxWidth: 420)
-                Button("Choose Code Folders…") { controller.setUpCodeSearch() }
+                Button(L10n.text("Choose Code Folders…")) { controller.setUpCodeSearch() }
                     .padding(.top, 4)
             } else {
-                Text("Search your code").font(.system(size: 15, weight: .semibold))
-                Text("Say what the code does, or type a name that's in it.").foregroundStyle(.secondary)
+                Text(L10n.text("Search your code")).font(.system(size: 15, weight: .semibold))
+                Text(L10n.text("Say what the code does, or type a name that's in it.")).foregroundStyle(.secondary)
                 VStack(spacing: 6) {
                     ForEach(Self.examples, id: \.self) { example in
                         Button { controller.tryExample(example) } label: {
diff --git a/Sources/DigUpApp/SearchWindow.swift b/Sources/DigUpApp/SearchWindow.swift
index 4fc54cc6..9821d114 100644
--- a/Sources/DigUpApp/SearchWindow.swift
+++ b/Sources/DigUpApp/SearchWindow.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import Observation
@@ -380,7 +381,7 @@ struct SearchWindowView: View {
                             Image(systemName: "xmark.circle.fill").foregroundStyle(.tertiary)
                         }
                         .buttonStyle(.plain)
-                        .help("Clear")
+                        .help(L10n.text("Clear"))
                     }
                 }
                 .padding(.horizontal, 12)
@@ -398,7 +399,7 @@ struct SearchWindowView: View {
                         .foregroundStyle(search.showsPreview ? AnyShapeStyle(Color.accentColor) : AnyShapeStyle(.secondary))
                 }
                 .buttonStyle(.plain)
-                .help(search.showsPreview ? "Hide Preview" : "Show Preview")
+                .help(search.showsPreview ? L10n.text("Hide Preview") : L10n.text("Show Preview"))
                 Button {
                     app.showSettings()
                 } label: {
@@ -407,7 +408,7 @@ struct SearchWindowView: View {
                         .foregroundStyle(.secondary)
                 }
                 .buttonStyle(.plain)
-                .help("Settings (⌘,)")
+                .help(L10n.text("Settings (⌘,)"))
             }
             .padding(.leading, 78)   // beside the window buttons
             .frame(height: 52)
@@ -421,12 +422,12 @@ struct SearchWindowView: View {
         if !model.hasFolders {
             VStack(spacing: 0) {
                 BrandMark()
-                Text("Choose folders to search").font(.system(size: 20, weight: .bold)).padding(.top, 18)
-                Text("DigUp only looks where you tell it to.")
+                Text(L10n.text("Choose folders to search")).font(.system(size: 20, weight: .bold)).padding(.top, 18)
+                Text(L10n.text("DigUp only looks where you tell it to."))
                     .font(.system(size: 13))
                     .foregroundStyle(.secondary)
                     .padding(.top, 6)
-                Button("Choose Folders…") { app.chooseFolders() }
+                Button(L10n.text("Choose Folders…")) { app.chooseFolders() }
                     .controlSize(.large)
                     .keyboardShortcut(.defaultAction)
                     .padding(.top, 18)
@@ -441,9 +442,9 @@ struct SearchWindowView: View {
             ProgressView().controlSize(.small).frame(maxWidth: .infinity, maxHeight: .infinity)
         } else if search.results.isEmpty {
             EmptyState(symbol: search.isCode ? FileKind.code.symbol : "magnifyingglass",
-                       title: "No good matches for “\(search.query.trimmingCharacters(in: .whitespaces))”",
-                       message: search.isCode ? "Try saying what the code does, or a name that's in it."
-                           : "Try describing what's in it: what you'd see or hear, or words you remember.")
+                       title: L10n.format("No good matches for “%1$@”", String(describing: search.query.trimmingCharacters(in: .whitespaces))),
+                       message: search.isCode ? L10n.text("Try saying what the code does, or a name that's in it.")
+                           : L10n.text("Try describing what's in it: what you'd see or hear, or words you remember."))
         } else if search.isCode {
             CodeResultsList(search: search)
         } else {
@@ -460,7 +461,7 @@ struct SearchWindowView: View {
             Button(model.statusLine) { app.showSettings(.folders) }
                 .buttonStyle(.plain)
                 .lineLimit(1)
-                .help("Folders and indexing")
+                .help(L10n.text("Folders and indexing"))
             Spacer()
             if search.hasResults, !search.query.isEmpty {
                 Text(model.resultsCaveat ?? resultCount).lineLimit(1)
@@ -469,11 +470,11 @@ struct SearchWindowView: View {
                 Button {
                     app.updates.checkNow()
                 } label: {
-                    Label("DigUp \(version) is available", systemImage: "arrow.down.circle.fill")
+                    Label(L10n.format("DigUp %1$@ is available", String(describing: version)), systemImage: "arrow.down.circle.fill")
                         .foregroundStyle(Brand.ember)
                 }
                 .buttonStyle(.plain)
-                .help("See what's new and update")
+                .help(L10n.text("See what's new and update"))
             }
         }
         .font(.system(size: 11))
@@ -484,15 +485,15 @@ struct SearchWindowView: View {
 
     /// Examples of what to type: code's with the Code chip on, and one of them with code search on (as the panel's).
     private var placeholder: String {
-        if search.filter == .code { return "Describe the code: “retry a request with backoff”, a name in it…" }
-        return model.hasCode ? "Describe it: “zebra in a video”, “code: retry with backoff”…"
-            : "Describe it: “receipt from the hardware store”, “zebra in a video”…"
+        if search.filter == .code { return L10n.text("Describe the code: “retry a request with backoff”, a name in it…") }
+        return model.hasCode ? L10n.text("Describe it: “zebra in a video”, “code: retry with backoff”…")
+            : L10n.text("Describe it: “receipt from the hardware store”, “zebra in a video”…")
     }
 
     private var resultCount: String {
         let count = search.results.ranked.count
-        return (count == 1 ? "1 result" : "\(count) results")
-            + (search.results.weaker.isEmpty ? "" : " · \(search.results.weaker.count) weaker")
+        return (count == 1 ? L10n.text("1 result") : L10n.format("%1$@ results", String(describing: count)))
+            + (search.results.weaker.isEmpty ? "" : L10n.format(" · %1$@ weaker", String(describing: search.results.weaker.count)))
     }
 }
 
@@ -504,7 +505,7 @@ private struct KindFilters: View {
 
     var body: some View {
         HStack(spacing: 6) {
-            chip(title: "All", symbol: nil, count: nil, selected: search.filter == nil && !search.isCode) {
+            chip(title: L10n.text("All"), symbol: nil, count: nil, selected: search.filter == nil && !search.isCode) {
                 search.filter = nil
             }
             ForEach(ResultGroupKind.files, id: \.self) { kind in
@@ -515,7 +516,7 @@ private struct KindFilters: View {
             }
             if showsCode {
                 Divider().frame(height: 16).padding(.horizontal, 4)
-                chip(title: "Code", symbol: FileKind.code.symbol, count: search.isCode ? search.counts[.code] : nil,
+                chip(title: L10n.text("Code"), symbol: FileKind.code.symbol, count: search.isCode ? search.counts[.code] : nil,
                      selected: search.isCode, shortcut: 7) {
                     search.filter = search.filter == .code ? nil : .code
                 }
@@ -723,7 +724,7 @@ private struct CodeResultRow: View {
             .fill(selected ? Color.accentColor.opacity(0.22) : Color.clear))
         .contentShape(Rectangle())
         .accessibilityElement(children: .ignore)
-        .accessibilityLabel("Code, \(row.name), \(row.reason)")
+        .accessibilityLabel(L10n.format("Code, %1$@, %2$@", String(describing: row.name), String(describing: row.reason)))
         .accessibilityAddTraits(selected ? .isSelected : [])
     }
 }
@@ -740,17 +741,17 @@ private struct CodeOffOrHint: View {
                 .font(.system(size: 34, weight: .medium))
                 .foregroundStyle(Brand.gradient)
             if phase == .codeOff {
-                Text("Code search is off").font(.system(size: 17, weight: .semibold))
-                Text("DigUp can find code by what it does, in the folders you pick. Code gets an index of its own and "
-                     + "never shows up in other searches.")
+                Text(L10n.text("Code search is off")).font(.system(size: 17, weight: .semibold))
+                Text(L10n.text("DigUp can find code by what it does, in the folders you pick. Code gets an index of its own and ")
+                     + L10n.text("never shows up in other searches."))
                     .font(.system(size: 13))
                     .foregroundStyle(.secondary)
                     .multilineTextAlignment(.center)
                     .frame(maxWidth: 420)
-                Button("Choose Code Folders…", action: chooseFolders).padding(.top, 6)
+                Button(L10n.text("Choose Code Folders…"), action: chooseFolders).padding(.top, 6)
             } else {
-                Text("Search your code").font(.system(size: 17, weight: .semibold))
-                Text("Say what the code does, or type a name that's in it.")
+                Text(L10n.text("Search your code")).font(.system(size: 17, weight: .semibold))
+                Text(L10n.text("Say what the code does, or type a name that's in it."))
                     .font(.system(size: 13))
                     .foregroundStyle(.secondary)
             }
@@ -796,7 +797,7 @@ struct WeakerToggle: View {
                 Image(systemName: "chevron.right")
                     .font(.system(size: 10, weight: .semibold))
                     .rotationEffect(.degrees(expanded ? 90 : 0))
-                Text(expanded ? "Weaker matches" : "\(count) weaker \(count == 1 ? "match" : "matches")")
+                Text(expanded ? L10n.text("Weaker matches") : L10n.format("%1$@ weaker %2$@", String(describing: count), String(describing: count == 1 ? "match" : "matches")))
                     .font(.system(size: 12, weight: .medium))
             }
             .foregroundStyle(.secondary)
@@ -842,25 +843,25 @@ private struct SearchHome: View {
     @State private var kinds: [FileKind: Int] = [:]
 
     private static let examples: [(text: String, kind: ResultGroupKind)] = [
-        ("a screenshot of an error message", .screenshots), ("receipt", .documents), ("whiteboard notes", .images),
-        ("someone laughing", .audio), ("a dog on the beach", .video), ("slides about the budget", .documents),
+        (L10n.text("a screenshot of an error message"), .screenshots), ("receipt", .documents), (L10n.text("whiteboard notes"), .images),
+        (L10n.text("someone laughing"), .audio), (L10n.text("a dog on the beach"), .video), (L10n.text("slides about the budget"), .documents),
     ]
 
     var body: some View {
         VStack(spacing: 0) {
             BrandMark()
-            Text("Describe it. Dig it up.")
+            Text(L10n.text("Describe it. Dig it up."))
                 .font(.system(size: 24, weight: .bold))
                 .padding(.top, 18)
-            Text("Type what you remember in the search field above: what's in it, what it looks or sounds like, or "
-                 + "words from it.")
+            Text(L10n.text("Type what you remember in the search field above: what's in it, what it looks or sounds like, or ")
+                 + L10n.text("words from it."))
                 .font(.system(size: 13))
                 .foregroundStyle(.secondary)
                 .multilineTextAlignment(.center)
                 .fixedSize(horizontal: false, vertical: true)
                 .frame(maxWidth: 440)
                 .padding(.top, 6)
-            Text("TRY")
+            Text(L10n.text("TRY"))
                 .font(.system(size: 10, weight: .semibold))
                 .tracking(0.8)
                 .foregroundStyle(.tertiary)
@@ -876,15 +877,15 @@ private struct SearchHome: View {
                 if !kinds.isEmpty {
                     HStack(spacing: 8) {
                         KindCounts(counts: kinds)
-                        Text("in \(folders)")
+                        Text(L10n.format("in %1$@", String(describing: folders)))
                     }
                 } else if model.status.searchable > 0 {
-                    Text("\(model.status.searchable.formatted()) files to search in \(folders)")
+                    Text(L10n.format("%1$@ files to search in %2$@", String(describing: model.status.searchable.formatted()), String(describing: folders)))
                 }
                 if let hotkey = model.hotkey {
                     HStack(spacing: 6) {
                         Keycaps(caps: hotkey.caps, size: 10)
-                        Text("opens DigUp from any app")
+                        Text(L10n.text("opens DigUp from any app"))
                     }
                 }
             }
@@ -905,12 +906,12 @@ private struct SearchHome: View {
 
     /// With code search on, one of code's too.
     private var examples: [(text: String, kind: ResultGroupKind)] {
-        Self.examples + (model.hasCode ? [("code: where the settings are saved", .code)] : [])
+        Self.examples + (model.hasCode ? [(L10n.text("code: where the settings are saved"), .code)] : [])
     }
 
     private var folders: String {
         let names = model.settings.roots.map(\.lastPathComponent)
-        return names.count <= 3 ? names.formatted(.list(type: .and)) : "\(names.count) folders"
+        return names.count <= 3 ? names.formatted(.list(type: .and)) : L10n.format("%1$@ folders", String(describing: names.count))
     }
 }
 
@@ -954,7 +955,7 @@ private struct ExampleChip: View {
             .contentShape(Capsule())
         }
         .buttonStyle(.plain)
-        .help("Search for “\(text)”")
+        .help(L10n.format("Search for “%1$@”", String(describing: text)))
         .onHover { inside in
             hovering = inside
             if inside { NSCursor.pointingHand.push() } else { NSCursor.pop() }
diff --git a/Sources/DigUpApp/SettingsWindow.swift b/Sources/DigUpApp/SettingsWindow.swift
index f56d40fd..d0d146b5 100644
--- a/Sources/DigUpApp/SettingsWindow.swift
+++ b/Sources/DigUpApp/SettingsWindow.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import DigUpKit
 import Observation
@@ -8,10 +9,10 @@ enum SettingsTab: String, CaseIterable {
 
     var title: String {
         switch self {
-        case .general: "General"
-        case .folders: "Folders"
-        case .code: "Code"
-        case .storage: "Storage"
+        case .general: L10n.text("General")
+        case .folders: L10n.text("Folders")
+        case .code: L10n.text("Code")
+        case .storage: L10n.text("Storage")
         }
     }
 
@@ -210,8 +211,8 @@ private struct GeneralSettings: View {
                                      listening: { state.app.hotkeyRecording($0) }, capSize: 13)
                 } label: {
                     VStack(alignment: .leading, spacing: 2) {
-                        Text("Search shortcut")
-                        Text("Opens the search panel from any app.")
+                        Text(L10n.text("Search shortcut"))
+                        Text(L10n.text("Opens the search panel from any app."))
                             .font(.system(size: 11))
                             .foregroundStyle(.secondary)
                     }
@@ -223,8 +224,8 @@ private struct GeneralSettings: View {
                     state.launchAtLogin = state.app.launchesAtLogin
                 })) {
                     VStack(alignment: .leading, spacing: 2) {
-                        Text("Open DigUp when you log in")
-                        Text(state.loginProblem ?? "So the shortcut always works.")
+                        Text(L10n.text("Open DigUp when you log in"))
+                        Text(state.loginProblem ?? L10n.text("So the shortcut always works."))
                             .font(.system(size: 11))
                             .foregroundStyle(state.loginProblem == nil ? AnyShapeStyle(.secondary) : AnyShapeStyle(.red))
                     }
@@ -236,18 +237,18 @@ private struct GeneralSettings: View {
                     state.checksForUpdates = on
                 })) {
                     VStack(alignment: .leading, spacing: 2) {
-                        Text("Check for updates automatically")
-                        Text("Once a day DigUp asks GitHub for its newest version; nothing about your files is sent. "
-                             + "Updates install with one click.")
+                        Text(L10n.text("Check for updates automatically"))
+                        Text(L10n.text("Once a day DigUp asks GitHub for its newest version; nothing about your files is sent. ")
+                             + L10n.text("Updates install with one click."))
                             .font(.system(size: 11))
                             .foregroundStyle(.secondary)
                             .fixedSize(horizontal: false, vertical: true)
                     }
                 }
                 LabeledContent {
-                    Button("Check Now") { state.app.updates.checkNow() }
+                    Button(L10n.text("Check Now")) { state.app.updates.checkNow() }
                 } label: {
-                    Text(state.model.updateAvailable.map { "DigUp \($0) is available" }
+                    Text(state.model.updateAvailable.map { L10n.format("DigUp %1$@ is available", String(describing: $0)) }
                          ?? "DigUp \(Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String ?? "")")
                 }
             }
@@ -269,7 +270,7 @@ private struct FolderSettings: View {
             Section {
                 if let summaries = state.summaries {
                     if summaries.isEmpty {
-                        Text("No folders yet. Add the ones DigUp should search.")
+                        Text(L10n.text("No folders yet. Add the ones DigUp should search."))
                             .foregroundStyle(.secondary)
                     }
                     ForEach(summaries) { summary in
@@ -279,11 +280,11 @@ private struct FolderSettings: View {
                     ProgressView().controlSize(.small).frame(maxWidth: .infinity)
                 }
             } header: {
-                Text("Folders to search")
+                Text(L10n.text("Folders to search"))
             } footer: {
                 HStack {
                     Button(action: state.addFolders) {
-                        Label("Add Folders…", systemImage: "plus")
+                        Label(L10n.text("Add Folders…"), systemImage: "plus")
                     }
                     Spacer()
                 }
@@ -302,25 +303,25 @@ private struct FolderSettings: View {
                             Image(systemName: "minus.circle.fill").foregroundStyle(.secondary)
                         }
                         .buttonStyle(.plain)
-                        .help("Search this folder again")
+                        .help(L10n.text("Search this folder again"))
                     }
                 }
                 if state.model.settings.excludedFolders.isEmpty {
-                    Text("None. Code projects, app bundles and caches are skipped anyway (code has its own tab).")
+                    Text(L10n.text("None. Code projects, app bundles and caches are skipped anyway (code has its own tab)."))
                         .foregroundStyle(.secondary)
                 }
             } header: {
-                Text("Skip these folders")
+                Text(L10n.text("Skip these folders"))
             } footer: {
                 HStack {
                     Button {
-                        state.app.pickFolders(for: NSApp.keyWindow, prompt: "Skip") { folders in
+                        state.app.pickFolders(for: NSApp.keyWindow, prompt: L10n.text("Skip")) { folders in
                             guard !folders.isEmpty else { return }
                             state.app.setExcluded(state.model.settings.excludedFolders
                                 + folders.filter { !state.model.settings.excludedFolders.contains($0) })
                         }
                     } label: {
-                        Label("Skip a Folder…", systemImage: "plus")
+                        Label(L10n.text("Skip a Folder…"), systemImage: "plus")
                     }
                     Spacer()
                 }
@@ -328,11 +329,11 @@ private struct FolderSettings: View {
             Section {
                 TypeExclusions(types: state.model.settings.excludedTypes) { state.app.setExcludedTypes($0) }
             } header: {
-                Text("Skip these file types")
+                Text(L10n.text("Skip these file types"))
             } footer: {
-                Text("DigUp only reads pictures, PDFs, documents (txt, md, rtf, docx, odt, html), audio and video here; "
-                     + "code is read only in the code folders (the Code tab). Keys, certificates and password files are "
-                     + "never read, nor are hidden folders like ~/.ssh.")
+                Text(L10n.text("DigUp only reads pictures, PDFs, documents (txt, md, rtf, docx, odt, html), audio and video here; ")
+                     + L10n.text("code is read only in the code folders (the Code tab). Keys, certificates and password files are ")
+                     + L10n.text("never read, nor are hidden folders like ~/.ssh."))
                     .font(.system(size: 11))
                     .foregroundStyle(.secondary)
                     .fixedSize(horizontal: false, vertical: true)
@@ -351,21 +352,20 @@ private struct FolderSettings: View {
                     state.app.setIndexHours(on: on, hours: state.model.settings.indexHours)
                 })) {
                     VStack(alignment: .leading, spacing: 2) {
-                        Text("Index only at set hours")
-                        Text("Files are read only between these times, and what changed meanwhile is picked up when "
-                             + "they begin. Search works all day.")
+                        Text(L10n.text("Index only at set hours"))
+                        Text(L10n.text("Files are read only between these times, and what changed meanwhile is picked up when they begin. Search works all day."))
                             .font(.system(size: 11))
                             .foregroundStyle(.secondary)
                             .fixedSize(horizontal: false, vertical: true)
                     }
                 }
                 if state.model.settings.indexHoursOn {
-                    LabeledContent("From") {
+                    LabeledContent(L10n.text("From")) {
                         HStack(spacing: 6) {
-                            DatePicker("From", selection: time(\.start), displayedComponents: .hourAndMinute)
+                            DatePicker(L10n.text("From"), selection: time(\.start), displayedComponents: .hourAndMinute)
                                 .labelsHidden()
-                            Text("to")
-                            DatePicker("To", selection: time(\.end), displayedComponents: .hourAndMinute)
+                            Text(L10n.text("to"))
+                            DatePicker(L10n.text("To"), selection: time(\.end), displayedComponents: .hourAndMinute)
                                 .labelsHidden()
                         }
                     }
@@ -377,19 +377,19 @@ private struct FolderSettings: View {
         .onChange(of: state.model.status) { state.statusChanged() }
         .confirmationDialog(removalTitle, isPresented: Binding(get: { removing != nil },
                                                                set: { if !$0 { removing = nil } })) {
-            Button("Remove", role: .destructive) {
+            Button(L10n.text("Remove"), role: .destructive) {
                 guard let removing else { return }
                 state.app.removeFolder(URL(fileURLWithPath: removing.path))
                 Task { await state.refresh() }
             }
         } message: {
-            Text("Its \(removing?.files.formatted() ?? "") files leave the index. Adding it back later indexes them "
-                 + "again.")
+            Text(L10n.format("Its %1$@ files leave the index. Adding it back later indexes them ", String(describing: removing?.files.formatted() ?? ""))
+                 + L10n.text("again."))
         }
     }
 
     private var removalTitle: String {
-        "Stop searching “\(removing.map { ($0.path as NSString).lastPathComponent } ?? "")”?"
+        L10n.format("Stop searching “%1$@”?", String(describing: removing.map { ($0.path as NSString).lastPathComponent } ?? ""))
     }
 
     /// One end of the set hours, as a time of day for a date picker.
@@ -415,7 +415,7 @@ private struct TypeExclusions: View {
     @FocusState private var focused: Bool
 
     var body: some View {
-        TextField("Extensions", text: $text, prompt: Text("e.g. heic, txt"))
+        TextField(L10n.text("Extensions"), text: $text, prompt: Text(L10n.text("e.g. heic, txt")))
             .labelsHidden()
             .focused($focused)
             .onSubmit { apply(text) }
@@ -443,7 +443,7 @@ private struct IndexProgress: View {
             }
             Spacer()
             if model.hasFolders {
-                Button(model.status.paused ? "Resume" : "Pause", action: togglePause)
+                Button(model.status.paused ? L10n.text("Resume") : L10n.text("Pause"), action: togglePause)
             }
         }
     }
@@ -451,12 +451,12 @@ private struct IndexProgress: View {
     /// "357 of 365 files searchable · 8 waiting · 2 long files to finish"
     private var detail: String {
         let status = model.status
-        var text = "\(status.searchable.formatted()) of \(status.files.formatted()) files searchable"
-        if status.pending > 0 { text += " · \(status.pending.formatted()) waiting" }
+        var text = L10n.format("%1$@ of %2$@ files searchable", String(describing: status.searchable.formatted()), String(describing: status.files.formatted()))
+        if status.pending > 0 { text += L10n.format(" · %1$@ waiting", String(describing: status.pending.formatted())) }
         if status.unfinished > 0 {
-            text += " · \(status.unfinished.formatted()) long \(status.unfinished == 1 ? "file" : "files") to finish"
+            text += L10n.format(" · %1$@ long %2$@ to finish", String(describing: status.unfinished.formatted()), String(describing: status.unfinished == 1 ? "file" : "files"))
         }
-        if model.download.isActive { text += " · model \(model.download.progressText)" }
+        if model.download.isActive { text += L10n.format(" · model %1$@", String(describing: model.download.progressText)) }
         return text
     }
 }
@@ -475,14 +475,14 @@ private struct FolderStatusRow: View {
                 HStack(spacing: 6) {
                     Text((summary.path as NSString).lastPathComponent).font(.system(size: 13, weight: .semibold))
                     if summary.missing || summary.unreadable {
-                        Text(summary.missing ? "Not connected" : "No access")
+                        Text(summary.missing ? L10n.text("Not connected") : L10n.text("No access"))
                             .font(.system(size: 10, weight: .semibold))
                             .padding(.horizontal, 6)
                             .padding(.vertical, 1)
                             .background(Capsule().fill(Color.orange.opacity(0.2)))
                     }
                     if summary.unreadable {
-                        Button("Allow in Settings…", action: openFolderPrivacySettings)
+                        Button(L10n.text("Allow in Settings…"), action: openFolderPrivacySettings)
                             .buttonStyle(.link)
                             .font(.system(size: 11))
                     }
@@ -498,8 +498,8 @@ private struct FolderStatusRow: View {
             }
             Spacer(minLength: 8)
             VStack(alignment: .trailing, spacing: 2) {
-                Text(summary.missing || summary.unreadable ? "Kept for when it's back"
-                     : "\(summary.indexed.formatted()) of \(summary.files.formatted()) indexed")
+                Text(summary.missing || summary.unreadable ? L10n.text("Kept for when it's back")
+                     : L10n.format("%1$@ of %2$@ indexed", String(describing: summary.indexed.formatted()), String(describing: summary.files.formatted())))
                     .font(.system(size: 12, weight: .medium).monospacedDigit())
                 if !states.isEmpty {
                     Text(states).font(.system(size: 11)).foregroundStyle(.secondary)
@@ -509,18 +509,18 @@ private struct FolderStatusRow: View {
                 Image(systemName: "minus.circle.fill").foregroundStyle(.secondary)
             }
             .buttonStyle(.plain)
-            .help("Stop searching this folder")
-            .accessibilityLabel("Remove \((summary.path as NSString).lastPathComponent)")
+            .help(L10n.text("Stop searching this folder"))
+            .accessibilityLabel(L10n.format("Remove %1$@", String(describing: (summary.path as NSString).lastPathComponent)))
         }
         .padding(.vertical, 2)
     }
 
     private var states: String {
-        [summary.pending > 0 ? "\(summary.pending.formatted()) waiting" : nil,
+        [summary.pending > 0 ? L10n.format("%1$@ waiting", String(describing: summary.pending.formatted())) : nil,
          summary.unfinished > 0
-            ? "\(summary.unfinished.formatted()) long \(summary.unfinished == 1 ? "file" : "files") to finish" : nil,
-         summary.skipped > 0 ? "\(summary.skipped.formatted()) skipped" : nil,
-         summary.failed > 0 ? "\(summary.failed.formatted()) couldn't be read" : nil].compactMap { $0 }
+            ? L10n.format("%1$@ long %2$@ to finish", String(describing: summary.unfinished.formatted()), String(describing: summary.unfinished == 1 ? "file" : "files")) : nil,
+         summary.skipped > 0 ? L10n.format("%1$@ skipped", String(describing: summary.skipped.formatted())) : nil,
+         summary.failed > 0 ? L10n.format("%1$@ couldn't be read", String(describing: summary.failed.formatted())) : nil].compactMap { $0 }
             .joined(separator: " · ")
     }
 }
@@ -534,61 +534,60 @@ private struct StorageSettings: View {
                 LabeledContent("EmbeddingGemma 2") {
                     Text("Google · Apache 2.0 · 865 MB")
                 }
-                LabeledContent("Status") {
+                LabeledContent(L10n.text("Status")) {
                     HStack(spacing: 8) {
-                        Text(state.model.download.isReady ? "Downloaded" : state.model.download.progressText)
+                        Text(state.model.download.isReady ? L10n.text("Downloaded") : state.model.download.progressText)
                         switch state.model.download.phase {
                         case .needed, .failed:
-                            Button("Download") { state.model.download.start() }.controlSize(.small)
-                            Button("Use Files…") { state.model.download.chooseFiles(for: NSApp.keyWindow) }
+                            Button(L10n.text("Download")) { state.model.download.start() }.controlSize(.small)
+                            Button(L10n.text("Use Files…")) { state.model.download.chooseFiles(for: NSApp.keyWindow) }
                                 .controlSize(.small)
                         default:
                             EmptyView()
                         }
                     }
                 }
-                LabeledContent("Location") {
+                LabeledContent(L10n.text("Location")) {
                     PathButton(url: state.model.settings.modelsDirectory)
                 }
             } header: {
-                Text("Model")
+                Text(L10n.text("Model"))
             } footer: {
                 if !state.model.download.isReady {
                     HStack(alignment: .firstTextBaseline) {
-                        Text("If your network blocks Hugging Face, download the two files on another network and "
-                             + "click Use Files… to choose them. DigUp checks them before it uses them.")
+                        Text(L10n.text("If your network blocks Hugging Face, download the two files on another network and click Use Files… to choose them. DigUp checks them before it uses them."))
                             .font(.system(size: 11))
                             .foregroundStyle(.secondary)
                             .fixedSize(horizontal: false, vertical: true)
                         Spacer()
-                        Button("Copy Links") {
+                        Button(L10n.text("Copy Links")) {
                             NSPasteboard.general.clearContents()
                             NSPasteboard.general.setString(ModelDownload.links, forType: .string)
                         }
                         .controlSize(.small)
-                        .help("Copies the addresses of the two files")
+                        .help(L10n.text("Copies the addresses of the two files"))
                     }
                 }
             }
-            Section("Index") {
-                LabeledContent("Size on disk", value: bytes(state.indexSize))
+            Section(L10n.text("Index")) {
+                LabeledContent(L10n.text("Size on disk"), value: bytes(state.indexSize))
                 if state.model.hasCode {
-                    LabeledContent("Code index", value: bytes(state.codeIndexSize))
+                    LabeledContent(L10n.text("Code index"), value: bytes(state.codeIndexSize))
                 }
-                LabeledContent("Location") {
+                LabeledContent(L10n.text("Location")) {
                     PathButton(url: state.model.settings.indexDirectory)
                 }
             }
-            Section("Privacy") {
-                Text("DigUp reads the folders you choose and keeps what it learns in its index, on this Mac. "
-                     + "It goes online only to download its model, once, and to check for updates (General), "
-                     + "which sends nothing about your files.")
+            Section(L10n.text("Privacy")) {
+                Text(L10n.text("DigUp reads the folders you choose and keeps what it learns in its index, on this Mac. ")
+                     + L10n.text("It goes online only to download its model, once, and to check for updates (General), ")
+                     + L10n.text("which sends nothing about your files."))
                     .foregroundStyle(.secondary)
                     .fixedSize(horizontal: false, vertical: true)
             }
             Section {
                 Text("DigUp \(Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String ?? "") · "
-                     + "EmbeddingGemma 2 by Google (Apache 2.0), run by llama.cpp (MIT).")
+                     + L10n.text("EmbeddingGemma 2 by Google (Apache 2.0), run by llama.cpp (MIT)."))
                     .font(.system(size: 11))
                     .foregroundStyle(.secondary)
             }
@@ -608,10 +607,10 @@ private struct CodeSettings: View {
         Form {
             Section {
                 VStack(alignment: .leading, spacing: 6) {
-                    Text("Search your code").font(.system(size: 13, weight: .semibold))
-                    Text("Find code by what it does, or by a name in it: type code: in the search panel, as in "
-                         + "“code: retry with backoff”. Code has an index of its own, and it never shows up in "
-                         + "other searches.")
+                    Text(L10n.text("Search your code")).font(.system(size: 13, weight: .semibold))
+                    Text(L10n.text("Find code by what it does, or by a name in it: type code: in the search panel, as in ")
+                         + L10n.text("“code: retry with backoff”. Code has an index of its own, and it never shows up in ")
+                         + L10n.text("other searches."))
                         .font(.system(size: 11))
                         .foregroundStyle(.secondary)
                         .fixedSize(horizontal: false, vertical: true)
@@ -633,44 +632,44 @@ private struct CodeSettings: View {
             }
             Section {
                 if state.codeSummaries.isEmpty {
-                    Text("No code folders yet. Add the folders that hold your projects.")
+                    Text(L10n.text("No code folders yet. Add the folders that hold your projects."))
                         .foregroundStyle(.secondary)
                 }
                 ForEach(state.codeSummaries) { summary in
                     FolderStatusRow(summary: summary) { removing = summary }
                 }
             } header: {
-                Text("Code folders")
+                Text(L10n.text("Code folders"))
             } footer: {
                 HStack {
                     Button(action: state.addCodeFolders) {
-                        Label(state.model.hasCode ? "Add Folders…" : "Choose Code Folders…", systemImage: "plus")
+                        Label(state.model.hasCode ? L10n.text("Add Folders…") : L10n.text("Choose Code Folders…"), systemImage: "plus")
                     }
                     Spacer()
                 }
             }
             Section {
-                Picker("Open code in", selection: Binding(get: { CodeEditor.current.id },
+                Picker(L10n.text("Open code in"), selection: Binding(get: { CodeEditor.current.id },
                                                           set: { state.app.setCodeEditor($0) })) {
                     ForEach(CodeEditor.installed) { editor in Text(editor.name).tag(editor.id) }
                     Text(CodeEditor.defaultApp.name).tag(CodeEditor.defaultApp.id)
                 }
             } footer: {
-                Text("A result opens there at the line that matched. Space shows the whole file in Quick Look.")
+                Text(L10n.text("A result opens there at the line that matched. Space shows the whole file in Quick Look."))
                     .font(.system(size: 11))
                     .foregroundStyle(.secondary)
             }
             Section {
-                Text("The code index keeps your code's text on this Mac, as the main index keeps your documents'. "
-                     + "It skips what git ignores, vendored and generated code, data files, and anything that looks "
-                     + "like a key or a password.")
+                Text(L10n.text("The code index keeps your code's text on this Mac, as the main index keeps your documents'. ")
+                     + L10n.text("It skips what git ignores, vendored and generated code, data files, and anything that looks ")
+                     + L10n.text("like a key or a password."))
                     .font(.system(size: 11))
                     .foregroundStyle(.secondary)
                     .fixedSize(horizontal: false, vertical: true)
                 if state.model.hasCode {
                     HStack {
                         Spacer()
-                        Button("Turn Off Code Search…", role: .destructive) { turningOff = true }
+                        Button(L10n.text("Turn Off Code Search…"), role: .destructive) { turningOff = true }
                     }
                 }
             }
@@ -678,23 +677,23 @@ private struct CodeSettings: View {
         .formStyle(.grouped)
         .scrollDisabled(true)
         .onChange(of: state.model.status) { state.statusChanged() }
-        .confirmationDialog("Turn off code search?", isPresented: $turningOff) {
-            Button("Turn Off", role: .destructive) {
+        .confirmationDialog(L10n.text("Turn off code search?"), isPresented: $turningOff) {
+            Button(L10n.text("Turn Off"), role: .destructive) {
                 state.app.applyCodeFolders([], excluded: [])
                 Task { await state.refresh() }
             }
         } message: {
-            Text("The code index (\(bytes(state.codeIndexSize))) is deleted. Turning it on again reads the code again.")
+            Text(L10n.format("The code index (%1$@) is deleted. Turning it on again reads the code again.", String(describing: bytes(state.codeIndexSize))))
         }
-        .confirmationDialog("Stop searching the code in “\(removing.map { ($0.path as NSString).lastPathComponent } ?? "")”?",
+        .confirmationDialog(L10n.format("Stop searching the code in “%1$@”?", String(describing: removing.map { ($0.path as NSString).lastPathComponent } ?? "")),
                             isPresented: Binding(get: { removing != nil }, set: { if !$0 { removing = nil } })) {
-            Button("Remove", role: .destructive) {
+            Button(L10n.text("Remove"), role: .destructive) {
                 guard let removing else { return }
                 state.app.removeCodeFolder(URL(fileURLWithPath: removing.path))
                 Task { await state.refresh() }
             }
         } message: {
-            Text("Its \(removing?.files.formatted() ?? "") code files leave the code index.")
+            Text(L10n.format("Its %1$@ code files leave the code index.", String(describing: removing?.files.formatted() ?? "")))
         }
     }
 }
@@ -713,6 +712,6 @@ private struct PathButton: View {
             }
         }
         .buttonStyle(.plain)
-        .help("Show in Finder")
+        .help(L10n.text("Show in Finder"))
     }
 }
diff --git a/Sources/DigUpApp/StatusMenu.swift b/Sources/DigUpApp/StatusMenu.swift
index 54a894f9..bada8a43 100644
--- a/Sources/DigUpApp/StatusMenu.swift
+++ b/Sources/DigUpApp/StatusMenu.swift
@@ -1,3 +1,4 @@
+import DigUpLocalization
 import AppKit
 import SwiftUI
 
@@ -132,39 +133,39 @@ final class StatusMenuController: NSObject, NSMenuDelegate {
         menu.addItem(header)
         menu.addItem(.separator())
         if let version = model.updateAvailable {
-            menu.addItem(ActionMenuItem("Update to DigUp \(version)…") { [weak self] in self?.onCheckForUpdates() })
+            menu.addItem(ActionMenuItem(L10n.format("Update to DigUp %1$@…", String(describing: version))) { [weak self] in self?.onCheckForUpdates() })
             menu.addItem(.separator())
         }
 
         if !model.hasFolders {
-            menu.addItem(ActionMenuItem("Choose Folders to Search…") { [weak self] in self?.onChooseFolders() })
+            menu.addItem(ActionMenuItem(L10n.text("Choose Folders to Search…")) { [weak self] in self?.onChooseFolders() })
         }
-        let search = ActionMenuItem("Search…") { [weak self] in self?.onSearch() }
+        let search = ActionMenuItem(L10n.text("Search…")) { [weak self] in self?.onSearch() }
         if let hotkey = model.hotkey, let (key, modifiers) = hotkey.menuEquivalent {
             search.keyEquivalent = key
             search.keyEquivalentModifierMask = modifiers
         }
         menu.addItem(search)
-        menu.addItem(ActionMenuItem("Open DigUp") { [weak self] in self?.onOpenWindow() })
+        menu.addItem(ActionMenuItem(L10n.text("Open DigUp")) { [weak self] in self?.onOpenWindow() })
         if model.hasFolders {
             menu.addItem(.separator())
             let paused = model.status.paused
-            menu.addItem(ActionMenuItem(paused ? "Resume Indexing" : "Pause Indexing") { [weak self] in
+            menu.addItem(ActionMenuItem(paused ? L10n.text("Resume Indexing") : L10n.text("Pause Indexing")) { [weak self] in
                 self?.onPauseChanged(!paused)
             })
         }
         switch model.download.phase {
         case .failed, .needed:
-            menu.addItem(ActionMenuItem("Download the Model") { [weak self] in self?.model.download.start() })
+            menu.addItem(ActionMenuItem(L10n.text("Download the Model")) { [weak self] in self?.model.download.start() })
         default:
             break
         }
         menu.addItem(.separator())
-        menu.addItem(ActionMenuItem("Settings…", key: ",") { [weak self] in self?.onSettings() })
+        menu.addItem(ActionMenuItem(L10n.text("Settings…"), key: ",") { [weak self] in self?.onSettings() })
         if model.updateAvailable == nil {
-            menu.addItem(ActionMenuItem("Check for Updates…") { [weak self] in self?.onCheckForUpdates() })
+            menu.addItem(ActionMenuItem(L10n.text("Check for Updates…")) { [weak self] in self?.onCheckForUpdates() })
         }
-        menu.addItem(ActionMenuItem("Quit DigUp", key: "q") { NSApp.terminate(nil) })
+        menu.addItem(ActionMenuItem(L10n.text("Quit DigUp"), key: "q") { NSApp.terminate(nil) })
     }
 
     /// The menu as text, for the -debugMenu launch argument (menus can't be clicked from a script).
@@ -216,13 +217,13 @@ struct MenuStatusView: View {
     private var detail: String? {
         if model.download.isActive { return model.download.progressText }
         if case .failed(let message) = model.download.phase { return message }
-        guard model.hasFolders else { return "Pick the folders it should search." }
+        guard model.hasFolders else { return L10n.text("Pick the folders it should search.") }
         let missing = Set(model.status.missingRoots), unreadable = Set(model.status.unreadableRoots)
         let names = model.settings.roots.map { root in
-            root.lastPathComponent + (missing.contains(root.path) ? " (not connected)"
-                                      : unreadable.contains(root.path) ? " (no access)" : "")
+            root.lastPathComponent + (missing.contains(root.path) ? L10n.text(" (not connected)")
+                                      : unreadable.contains(root.path) ? L10n.text(" (no access)") : "")
         }
-        return "In " + names.joined(separator: ", ")
+        return L10n.text("In ") + names.joined(separator: ", ")
     }
 }
 
diff --git a/Sources/DigUpLocalization/L10n.swift b/Sources/DigUpLocalization/L10n.swift
new file mode 100644
index 00000000..3e63bfd5
--- /dev/null
+++ b/Sources/DigUpLocalization/L10n.swift
@@ -0,0 +1,15 @@
+import Foundation
+
+/// Interface localization only. Queries, file paths, persisted settings and helper protocols keep their original values.
+public enum L10n {
+    static let bundle = Bundle.module
+
+    public static func text(_ key: String) -> String {
+        bundle.localizedString(forKey: key, value: nil, table: "Localizable")
+    }
+
+    /// Positional arguments let a translation reorder display values without changing their formatting.
+    public static func format(_ key: String, _ arguments: CVarArg...) -> String {
+        String(format: text(key), locale: Locale.current, arguments: arguments)
+    }
+}
diff --git a/Sources/DigUpLocalization/Resources/en.lproj/InfoPlist.strings b/Sources/DigUpLocalization/Resources/en.lproj/InfoPlist.strings
new file mode 100644
index 00000000..640c8a6e
--- /dev/null
+++ b/Sources/DigUpLocalization/Resources/en.lproj/InfoPlist.strings
@@ -0,0 +1,5 @@
+"NSAppleEventsUsageDescription" = "DigUp asks QuickTime Player to open a recording at the moment that matched your search.";
+"NSDesktopFolderUsageDescription" = "DigUp indexes the folders you choose so you can search them by describing what's inside. Everything stays on this Mac.";
+"NSDocumentsFolderUsageDescription" = "DigUp indexes the folders you choose so you can search them by describing what's inside. Everything stays on this Mac.";
+"NSDownloadsFolderUsageDescription" = "DigUp indexes the folders you choose so you can search them by describing what's inside. Everything stays on this Mac.";
+"NSRemovableVolumesUsageDescription" = "DigUp indexes the folders you choose so you can search them by describing what's inside. Everything stays on this Mac.";
diff --git a/Sources/DigUpLocalization/Resources/en.lproj/Localizable.strings b/Sources/DigUpLocalization/Resources/en.lproj/Localizable.strings
new file mode 100644
index 00000000..4149e595
--- /dev/null
+++ b/Sources/DigUpLocalization/Resources/en.lproj/Localizable.strings
@@ -0,0 +1,427 @@
+/* DigUp interface strings. Positional %@ arguments contain already formatted display values. */
+" (about %1$@ on this Mac)" = " (about %1$@ on this Mac)";
+" (no access)" = " (no access)";
+" (not connected)" = " (not connected)";
+" + %1$@ later" = " + %1$@ later";
+" Long PDFs and documents get their first pages in that time, and the rest " = " Long PDFs and documents get their first pages in that time, and the rest ";
+" at %1$@" = " at %1$@";
+" at line %1$@" = " at line %1$@";
+" in your code" = " in your code";
+" of " = " of ";
+" · %1$@ long %2$@ to finish" = " · %1$@ long %2$@ to finish";
+" · %1$@ waiting" = " · %1$@ waiting";
+" · %1$@ weaker" = " · %1$@ weaker";
+" · model %1$@" = " · model %1$@";
+" · paused" = " · paused";
+"%.1f h" = "%.1f h";
+"%1$@ %2$@ indexed" = "%1$@ %2$@ indexed";
+"%1$@ %2$@ indexed yet" = "%1$@ %2$@ indexed yet";
+"%1$@ %2$@ waiting" = "%1$@ %2$@ waiting";
+"%1$@ cells" = "%1$@ cells";
+"%1$@ code %2$@ indexed" = "%1$@ code %2$@ indexed";
+"%1$@ code files waiting · %2$@" = "%1$@ code files waiting · %2$@";
+"%1$@ couldn't be read" = "%1$@ couldn't be read";
+"%1$@ files to search in %2$@" = "%1$@ files to search in %2$@";
+"%1$@ folders" = "%1$@ folders";
+"%1$@ lines" = "%1$@ lines";
+"%1$@ long %2$@" = "%1$@ long %2$@";
+"%1$@ long %2$@ to finish" = "%1$@ long %2$@ to finish";
+"%1$@ min" = "%1$@ min";
+"%1$@ of %2$@ files searchable" = "%1$@ of %2$@ files searchable";
+"%1$@ of %2$@ indexed" = "%1$@ of %2$@ indexed";
+"%1$@ pages" = "%1$@ pages";
+"%1$@ results" = "%1$@ results";
+"%1$@ s" = "%1$@ s";
+"%1$@ skipped" = "%1$@ skipped";
+"%1$@ to be indexed" = "%1$@ to be indexed";
+"%1$@ waiting" = "%1$@ waiting";
+"%1$@ weaker %2$@" = "%1$@ weaker %2$@";
+"%1$@ – playing from " = "%1$@ – playing from ";
+"(%1$@). Until then, search finds files by name." = "(%1$@). Until then, search finds files by name.";
+"+ %1$@ later" = "+ %1$@ later";
+", %1$@ read so far" = ", %1$@ read so far";
+", and %1$@ more for long files" = ", and %1$@ more for long files";
+", as part of “%1$@”." = ", as part of “%1$@”.";
+"1 cell" = "1 cell";
+"1 line" = "1 line";
+"1 page" = "1 page";
+"1 result" = "1 result";
+"< 1 s" = "< 1 s";
+"A result opens there at the line that matched. Space shows the whole file in Quick Look." = "A result opens there at the line that matched. Space shows the whole file in Quick Look.";
+"About %1$@" = "About %1$@";
+"About DigUp" = "About DigUp";
+"Add" = "Add";
+"Add Folders" = "Add Folders";
+"Add Folders…" = "Add Folders…";
+"Add Folder…" = "Add Folder…";
+"Add folders to search" = "Add folders to search";
+"Adds %1$@ of indexing" = "Adds %1$@ of indexing";
+"Adds %1$@ of indexing and %2$@" = "Adds %1$@ of indexing and %2$@";
+"All" = "All";
+"Allow in Settings…" = "Allow in Settings…";
+"Another app is using %1$@" = "Another app is using %1$@";
+"At %1$@ of %2$@" = "At %1$@ of %2$@";
+"Audio" = "Audio";
+"Back" = "Back";
+"Can't create %1$@" = "Can't create %1$@";
+"Can't open the index" = "Can't open the index";
+"Can't save the model: %1$@" = "Can't save the model: %1$@";
+"Can't start indexing" = "Can't start indexing";
+"Cancel" = "Cancel";
+"Check Now" = "Check Now";
+"Check for Updates…" = "Check for Updates…";
+"Check for updates automatically" = "Check for updates automatically";
+"Check the folders to add" = "Check the folders to add";
+"Check the folders with your code" = "Check the folders with your code";
+"Checking folders…" = "Checking folders…";
+"Checking the download…" = "Checking the download…";
+"Checking the model download…" = "Checking the model download…";
+"Choose Another Folder…" = "Choose Another Folder…";
+"Choose Code Folders…" = "Choose Code Folders…";
+"Choose Folders to Search…" = "Choose Folders to Search…";
+"Choose Folders…" = "Choose Folders…";
+"Choose among its subfolders" = "Choose among its subfolders";
+"Choose at least one folder" = "Choose at least one folder";
+"Choose folders for DigUp to search." = "Choose folders for DigUp to search.";
+"Choose folders to search" = "Choose folders to search";
+"Clear" = "Clear";
+"Click to change" = "Click to change";
+"Click to set a shortcut" = "Click to set a shortcut";
+"Close" = "Close";
+"Code" = "Code";
+"Code Folders" = "Code Folders";
+"Code folders" = "Code folders";
+"Code index" = "Code index";
+"Code is read once the model has downloaded" = "Code is read once the model has downloaded";
+"Code search is off" = "Code search is off";
+"Code search reads source files, notebooks and a repo's own docs. It skips what git ignores, vendored " = "Code search reads source files, notebooks and a repo's own docs. It skips what git ignores, vendored ";
+"Code, %1$@, %2$@" = "Code, %1$@, %2$@";
+"Code, keys, certificates, hidden folders, app bundles and caches are always skipped." = "Code, keys, certificates, hidden folders, app bundles and caches are always skipped.";
+"Continue" = "Continue";
+"Copied %1$@" = "Copied %1$@";
+"Copy" = "Copy";
+"Copy Path" = "Copy Path";
+"Copy the file, to paste anywhere" = "Copy the file, to paste anywhere";
+"Couldn't look inside it; it can still be searched." = "Couldn't look inside it; it can still be searched.";
+"Cut" = "Cut";
+"Describe it. Dig it up." = "Describe it. Dig it up.";
+"Describe it: “payment error screenshot”, “zebra in a video”…" = "Describe it: “payment error screenshot”, “zebra in a video”…";
+"Describe it: “receipt from the hardware store”, “zebra in a video”…" = "Describe it: “receipt from the hardware store”, “zebra in a video”…";
+"Describe it: “zebra in a video”, “code: retry with backoff”…" = "Describe it: “zebra in a video”, “code: retry with backoff”…";
+"Describe the code: “retry a request with backoff”, a name in it…" = "Describe the code: “retry a request with backoff”, a name in it…";
+"DigUp %1$@ is available" = "DigUp %1$@ is available";
+"DigUp can find code by what it does, in the folders you pick. Code gets an index of its own " = "DigUp can find code by what it does, in the folders you pick. Code gets an index of its own ";
+"DigUp can find code by what it does, in the folders you pick. Code gets an index of its own and " = "DigUp can find code by what it does, in the folders you pick. Code gets an index of its own and ";
+"DigUp can find code by what it does: type code: in the search panel, as in " = "DigUp can find code by what it does: type code: in the search panel, as in ";
+"DigUp is reading your folders%1$@, newest files first. You can search right away; " = "DigUp is reading your folders%1$@, newest files first. You can search right away; ";
+"DigUp lives in the menu bar, which shows how indexing is going." = "DigUp lives in the menu bar, which shows how indexing is going.";
+"DigUp only looks where you tell it to." = "DigUp only looks where you tell it to.";
+"DigUp only reads files: it never changes, moves or uploads them." = "DigUp only reads files: it never changes, moves or uploads them.";
+"DigUp only reads pictures, PDFs, documents (txt, md, rtf, docx, odt, html), audio and video here; " = "DigUp only reads pictures, PDFs, documents (txt, md, rtf, docx, odt, html), audio and video here; ";
+"DigUp only searches the folders you pick." = "DigUp only searches the folders you pick.";
+"DigUp reads a new folder once, then keeps up with what changes in it. " = "DigUp reads a new folder once, then keeps up with what changes in it. ";
+"DigUp reads each once, then what changes. Code is searched on its own: type " = "DigUp reads each once, then what changes. Code is searched on its own: type ";
+"DigUp reads the folders you choose and keeps what it learns in its index, on this Mac. " = "DigUp reads the folders you choose and keeps what it learns in its index, on this Mac. ";
+"DigUp starts reading your folders%1$@ once the model has downloaded " = "DigUp starts reading your folders%1$@ once the model has downloaded ";
+"Document" = "Document";
+"Documents" = "Documents";
+"Done" = "Done";
+"Download" = "Download";
+"Download the Model" = "Download the Model";
+"Downloaded" = "Downloaded";
+"Downloading model · %1$@%%" = "Downloading model · %1$@%%";
+"Downloading the model · %1$@" = "Downloading the model · %1$@";
+"Downloading the model · %1$@%%" = "Downloading the model · %1$@%%";
+"Edit" = "Edit";
+"EmbeddingGemma 2 by Google (Apache 2.0), run by llama.cpp (MIT)." = "EmbeddingGemma 2 by Google (Apache 2.0), run by llama.cpp (MIT).";
+"Esc cancels" = "Esc cancels";
+"Everything is indexed and searched on this Mac. DigUp downloads its AI model (865 MB) once; " = "Everything is indexed and searched on this Mac. DigUp downloads its AI model (865 MB) once; ";
+"Extensions" = "Extensions";
+"File" = "File";
+"File types" = "File types";
+"Find code by what it does, or by a name in it: type code: in the search panel, as in " = "Find code by what it does, or by a name in it: type code: in the search panel, as in ";
+"Finder's search window uses %1$@" = "Finder's search window uses %1$@";
+"First pass: about %1$@" = "First pass: about %1$@";
+"Folders" = "Folders";
+"Folders and indexing" = "Folders and indexing";
+"Folders to search" = "Folders to search";
+"General" = "General";
+"Get Started" = "Get Started";
+"Has your words" = "Has your words";
+"Hide DigUp" = "Hide DigUp";
+"Hide Preview" = "Hide Preview";
+"Hide its subfolders" = "Hide its subfolders";
+"Hide the subfolders of %1$@" = "Hide the subfolders of %1$@";
+"How long reading this code takes, once, and about how much room its index needs. After " = "How long reading this code takes, once, and about how much room its index needs. After ";
+"Hugging Face answered %1$@" = "Hugging Face answered %1$@";
+"IN THE SEARCH PANEL" = "IN THE SEARCH PANEL";
+"Image" = "Image";
+"Images" = "Images";
+"In " = "In ";
+"Index" = "Index";
+"Index on battery power" = "Index on battery power";
+"Indexing %1$@%%" = "Indexing %1$@%%";
+"Indexing %1$@%% · %2$@ of %3$@" = "Indexing %1$@%% · %2$@ of %3$@";
+"Indexing code %1$@%% · %2$@ of %3$@" = "Indexing code %1$@%% · %2$@ of %3$@";
+"Indexing paused" = "Indexing paused";
+"Indexing stopped" = "Indexing stopped";
+"It goes online only to download its model, once, and to check for updates (General), " = "It goes online only to download its model, once, and to check for updates (General), ";
+"It skips what git ignores, vendored and generated code, data files, and anything that looks " = "It skips what git ignores, vendored and generated code, data files, and anything that looks ";
+"Its %1$@ code files leave the code index." = "Its %1$@ code files leave the code index.";
+"Its %1$@ files leave the index. Adding it back later indexes them " = "Its %1$@ files leave the index. Adding it back later indexes them ";
+"Kept for when it's back" = "Kept for when it's back";
+"Location" = "Location";
+"Looking at the folders…" = "Looking at the folders…";
+"Looking at your code…" = "Looking at your code…";
+"Looking at your folders…" = "Looking at your folders…";
+"Low Power Mode" = "Low Power Mode";
+"Mac is warm" = "Mac is warm";
+"Matches %1$@" = "Matches %1$@";
+"Matches its name" = "Matches its name";
+"Matches its text" = "Matches its text";
+"Matches the frame at %1$@" = "Matches the frame at %1$@";
+"Matches the picture" = "Matches the picture";
+"Matches the sound at %1$@" = "Matches the sound at %1$@";
+"Matches the text in it" = "Matches the text in it";
+"Matches the text on %1$@" = "Matches the text on %1$@";
+"Matches what's heard at %1$@" = "Matches what's heard at %1$@";
+"Matches what's on screen" = "Matches what's on screen";
+"Matching words only until the model has downloaded (%1$@%%)" = "Matching words only until the model has downloaded (%1$@%%)";
+"Matching words only: the model isn't downloaded" = "Matching words only: the model isn't downloaded";
+"Matching words; meaning search is warming up…" = "Matching words; meaning search is warming up…";
+"Matching words…" = "Matching words…";
+"Minimize" = "Minimize";
+"Model" = "Model";
+"Model download: waiting for the network" = "Model download: waiting for the network";
+"Model not downloaded" = "Model not downloaded";
+"Model ready" = "Model ready";
+"Moments inside audio and video" = "Moments inside audio and video";
+"Needs %1$@ free on this disk" = "Needs %1$@ free on this disk";
+"New Search" = "New Search";
+"No access" = "No access";
+"No code folders yet. Add the folders that hold your projects." = "No code folders yet. Add the folders that hold your projects.";
+"No code here" = "No code here";
+"No folders chosen yet" = "No folders chosen yet";
+"No folders yet. Add the ones DigUp should search." = "No folders yet. Add the ones DigUp should search.";
+"No good matches" = "No good matches";
+"No good matches for “%1$@”" = "No good matches for “%1$@”";
+"No good matches in your code" = "No good matches in your code";
+"None. Code projects, app bundles and caches are skipped anyway (code has its own tab)." = "None. Code projects, app bundles and caches are skipped anyway (code has its own tab).";
+"Not connected" = "Not connected";
+"Not downloaded yet" = "Not downloaded yet";
+"Nothing to search here yet" = "Nothing to search here yet";
+"Nothing to search in the subfolders checked" = "Nothing to search in the subfolders checked";
+"Off unless you turn it on." = "Off unless you turn it on.";
+"Once a day DigUp asks GitHub for its newest version; nothing about your files is sent. " = "Once a day DigUp asks GitHub for its newest version; nothing about your files is sent. ";
+"Open" = "Open";
+"Open DigUp" = "Open DigUp";
+"Open DigUp from anywhere" = "Open DigUp from anywhere";
+"Open DigUp when you log in" = "Open DigUp when you log in";
+"Open a folder to pick some of its subfolders." = "Open a folder to pick some of its subfolders.";
+"Open at %1$@" = "Open at %1$@";
+"Open code in" = "Open code in";
+"Open in %1$@" = "Open in %1$@";
+"Open the file" = "Open the file";
+"Open them in the DigUp window (⌘O shows everything)" = "Open them in the DigUp window (⌘O shows everything)";
+"Opens the search panel from any app." = "Opens the search panel from any app.";
+"PDFs" = "PDFs";
+"PDFs and documents" = "PDFs and documents";
+"Part %1$@ of %2$@" = "Part %1$@ of %2$@";
+"Paste" = "Paste";
+"Pause" = "Pause";
+"Pause Indexing" = "Pause Indexing";
+"Paused · %1$@" = "Paused · %1$@";
+"Paused · %1$@ code files waiting" = "Paused · %1$@ code files waiting";
+"Pick folders, or open one to pick some of its subfolders. You can change this " = "Pick folders, or open one to pick some of its subfolders. You can change this ";
+"Pick the folders it should search." = "Pick the folders it should search.";
+"Pick the folders that hold your projects; open one to pick among its repos. " = "Pick the folders that hold your projects; open one to pick among its repos. ";
+"Play" = "Play";
+"Play from %1$@" = "Play from %1$@";
+"Press the new shortcut…" = "Press the new shortcut…";
+"Press the shortcut in any app, describe what you're looking for, and press Return." = "Press the shortcut in any app, describe what you're looking for, and press Return.";
+"Privacy" = "Privacy";
+"Quick Look, after arrowing to a result" = "Quick Look, after arrowing to a result";
+"Quit DigUp" = "Quit DigUp";
+"Reading the rest of %1$@ · %2$@%%" = "Reading the rest of %1$@ · %2$@%%";
+"Ready" = "Ready";
+"Recording a new shortcut" = "Recording a new shortcut";
+"Redo" = "Redo";
+"Remove" = "Remove";
+"Remove %1$@" = "Remove %1$@";
+"Resume" = "Resume";
+"Resume Indexing" = "Resume Indexing";
+"Say what the code does, or type a name that's in it." = "Say what the code does, or type a name that's in it.";
+"Screenshot" = "Screenshot";
+"Screenshots" = "Screenshots";
+"Screenshots and photos" = "Screenshots and photos";
+"Screenshots use %1$@" = "Screenshots use %1$@";
+"Search" = "Search";
+"Search for “%1$@”" = "Search for “%1$@”";
+"Search my code" = "Search my code";
+"Search panel open" = "Search panel open";
+"Search shortcut" = "Search shortcut";
+"Search this folder again" = "Search this folder again";
+"Search your code" = "Search your code";
+"Search your code too?" = "Search your code too?";
+"Searching your code" = "Searching your code";
+"Searching…" = "Searching…";
+"Search…" = "Search…";
+"See what's new and update" = "See what's new and update";
+"Select All" = "Select All";
+"Settings (⌘,)" = "Settings (⌘,)";
+"Settings…" = "Settings…";
+"Shortcut %1$@, click to change" = "Shortcut %1$@, click to change";
+"Show %1$@ more" = "Show %1$@ more";
+"Show Preview" = "Show Preview";
+"Show all %1$@ %2$@…" = "Show all %1$@ %2$@…";
+"Show in Finder" = "Show in Finder";
+"Show it in Finder" = "Show it in Finder";
+"Show the subfolders of %1$@" = "Show the subfolders of %1$@";
+"Size on disk" = "Size on disk";
+"Skip" = "Skip";
+"Skip a Folder…" = "Skip a Folder…";
+"Skip some folders or file types" = "Skip some folders or file types";
+"Skip these file types" = "Skip these file types";
+"Skip these folders" = "Skip these folders";
+"So the shortcut always works." = "So the shortcut always works.";
+"Spotlight uses %1$@" = "Spotlight uses %1$@";
+"Starting…" = "Starting…";
+"Status" = "Status";
+"Step %1$@ of %2$@" = "Step %1$@ of %2$@";
+"Still indexing (%1$@%%): some files aren't in yet" = "Still indexing (%1$@%%): some files aren't in yet";
+"Still reading code (%1$@%%): some isn't in yet" = "Still reading code (%1$@%%): some isn't in yet";
+"Stop searching the code in “%1$@”?" = "Stop searching the code in “%1$@”?";
+"Stop searching this folder" = "Stop searching this folder";
+"Stop searching “%1$@”?" = "Stop searching “%1$@”?";
+"Storage" = "Storage";
+"Switching input sources uses %1$@" = "Switching input sources uses %1$@";
+"TRY" = "TRY";
+"That's it. It works from any app." = "That's it. It works from any app.";
+"The code index (%1$@) is deleted. Turning it on again reads the code again." = "The code index (%1$@) is deleted. Turning it on again reads the code again.";
+"The code index keeps your code's text on this Mac, as the main index keeps your documents'. " = "The code index keeps your code's text on this Mac, as the main index keeps your documents'. ";
+"The download couldn't resume" = "The download couldn't resume";
+"The download stopped early" = "The download stopped early";
+"The download was damaged twice. Try again later." = "The download was damaged twice. Try again later.";
+"The emoji picker uses %1$@" = "The emoji picker uses %1$@";
+"The file's default app" = "The file's default app";
+"The first pass takes this long. Long PDFs and documents get their first pages in it, " = "The first pass takes this long. Long PDFs and documents get their first pages in it, ";
+"The model isn't downloaded yet" = "The model isn't downloaded yet";
+"They match much less well than the results above. Press Return to " = "They match much less well than the results above. Press Return to ";
+"Try Again" = "Try Again";
+"Try describing what's in it: what you'd see or hear, or words you remember." = "Try describing what's in it: what you'd see or hear, or words you remember.";
+"Try it now: press %1$@." = "Try it now: press %1$@.";
+"Try saying what the code does, or a name that's in it." = "Try saying what the code does, or a name that's in it.";
+"Try what you'd see or hear in it, or words you remember from it." = "Try what you'd see or hear in it, or words you remember from it.";
+"Turn Off" = "Turn Off";
+"Turn Off Code Search…" = "Turn Off Code Search…";
+"Turn off code search?" = "Turn off code search?";
+"Type what you remember in the search field above: what's in it, what it looks or sounds like, or " = "Type what you remember in the search field above: what's in it, what it looks or sounds like, or ";
+"Under a second" = "Under a second";
+"Undo" = "Undo";
+"Update to DigUp %1$@…" = "Update to DigUp %1$@…";
+"Updates install with one click." = "Updates install with one click.";
+"Use ⌘, ⌥ or ⌃ with a key" = "Use ⌘, ⌥ or ⌃ with a key";
+"Video" = "Video";
+"Waiting for a network connection" = "Waiting for a network connection";
+"Waiting for the network…" = "Waiting for the network…";
+"Weaker matches" = "Weaker matches";
+"Welcome to DigUp" = "Welcome to DigUp";
+"What should DigUp search?" = "What should DigUp search?";
+"When it's off, a folder's first pass waits for a charger. New files always go in right away." = "When it's off, a folder's first pass waits for a charger. New files always go in right away.";
+"Window" = "Window";
+"Words only: meaning search isn't available" = "Words only: meaning search isn't available";
+"You're all set" = "You're all set";
+"a dog on the beach" = "a dog on the beach";
+"a page" = "a page";
+"a screenshot of an error message" = "a screenshot of an error message";
+"about %1$@" = "about %1$@";
+"about %1$@ left" = "about %1$@ left";
+"after that it works offline, and nothing you index ever leaves your Mac." = "after that it works offline, and nothing you index ever leaves your Mac.";
+"afterwards (about %1$@ more)." = "afterwards (about %1$@ more).";
+"again." = "again.";
+"and generated code, data files, and anything that looks like a key or a password." = "and generated code, data files, and anything that looks like a key or a password.";
+"and never shows up in other searches." = "and never shows up in other searches.";
+"and the rest afterwards, once everything else is in." = "and the rest afterwards, once everything else is in.";
+"anytime in Settings." = "anytime in Settings.";
+"audio file" = "audio file";
+"audio files" = "audio files";
+"cell %1$@" = "cell %1$@";
+"cells %1$@–%2$@" = "cells %1$@–%2$@";
+"code file" = "code file";
+"code files" = "code files";
+"code is read only in the code folders (the Code tab). Keys, certificates and password files are " = "code is read only in the code folders (the Code tab). Keys, certificates and password files are ";
+"code: in the search panel." = "code: in the search panel.";
+"code: parse the command line options" = "code: parse the command line options";
+"code: retry a request with backoff" = "code: retry a request with backoff";
+"code: where the settings are saved" = "code: where the settings are saved";
+"document" = "document";
+"documents" = "documents";
+"e.g. heic, txt" = "e.g. heic, txt";
+"fold them away." = "fold them away.";
+"image" = "image";
+"images" = "images";
+"in %1$@" = "in %1$@";
+"less than a minute left" = "less than a minute left";
+"like a key or a password." = "like a key or a password.";
+"line %1$@" = "line %1$@";
+"lines %1$@–%2$@" = "lines %1$@–%2$@";
+"long files" = "long files";
+"macOS isn't letting DigUp read it." = "macOS isn't letting DigUp read it.";
+"macOS uses %1$@ for one of its shortcuts" = "macOS uses %1$@ for one of its shortcuts";
+"macOS will ask before DigUp can read folders like Desktop, Documents and Downloads. " = "macOS will ask before DigUp can read folders like Desktop, Documents and Downloads. ";
+"never read, nor are hidden folders like ~/.ssh." = "never read, nor are hidden folders like ~/.ssh.";
+"never shows up in other searches." = "never shows up in other searches.";
+"on battery" = "on battery";
+"opens DigUp from any app" = "opens DigUp from any app";
+"other searches." = "other searches.";
+"p. %1$@" = "p. %1$@";
+"page %1$@" = "page %1$@";
+"partly read so far" = "partly read so far";
+"results fill in as it goes." = "results fill in as it goes.";
+"screenshot" = "screenshot";
+"screenshots" = "screenshots";
+"searches. You can turn it on later in Settings → Code." = "searches. You can turn it on later in Settings → Code.";
+"show them." = "show them.";
+"slides about the budget" = "slides about the budget";
+"someone laughing" = "someone laughing";
+"that, only what changes is read again." = "that, only what changes is read again.";
+"under a second" = "under a second";
+"video" = "video";
+"videos" = "videos";
+"which sends nothing about your files." = "which sends nothing about your files.";
+"whiteboard notes" = "whiteboard notes";
+"words from it." = "words from it.";
+"“%1$@” is searched already" = "“%1$@” is searched already";
+"“%1$@” isn't searched anyway." = "“%1$@” isn't searched anyway.";
+"“code: retry with backoff”. Code has an index of its own, and it never shows up in " = "“code: retry with backoff”. Code has an index of its own, and it never shows up in ";
+"“code: retry with backoff”. It gets an index of its own and never shows up in other " = "“code: retry with backoff”. It gets an index of its own and never shows up in other ";
+"“that payment error”, “the zebra”, “whiteboard from Tuesday”" = "“that payment error”, “the zebra”, “whiteboard from Tuesday”";
+"“the clause about pets in the lease”, “flight receipt”" = "“the clause about pets in the lease”, “flight receipt”";
+"“where they talk about sleep”, “the part with the drums”" = "“where they talk about sleep”, “the part with the drums”";
+"↩ %1$@   ⌘↩ Reveal   ␣ Quick Look%2$@   ⌘C Copy" = "↩ %1$@   ⌘↩ Reveal   ␣ Quick Look%2$@   ⌘C Copy";
+"↩ %1$@%2$@   ⌘↩ Reveal   ␣ Quick Look   ⌘C Copy" = "↩ %1$@%2$@   ⌘↩ Reveal   ␣ Quick Look   ⌘C Copy";
+"⚠︎ The model download stopped" = "⚠︎ The model download stopped";
+"the code" = "the code";
+"none" = "none";
+
+/* Added in DigUp 0.6.1. */
+" and " = " and ";
+"%1$@ %2$@ indexed · %3$@" = "%1$@ %2$@ indexed · %3$@";
+"%1$@ code %2$@ waiting · read after your other files" = "%1$@ code %2$@ waiting · read after your other files";
+"%1$@ code files waiting · indexing from %2$@" = "%1$@ code files waiting · indexing from %2$@";
+"Choose the model files you downloaded: %1$@." = "Choose the model files you downloaded: %1$@.";
+"Copies the addresses of the two files" = "Copies the addresses of the two files";
+"Copy Links" = "Copy Links";
+"Downloaded the model's two files somewhere else? Choose them here." = "Downloaded the model's two files somewhere else? Choose them here.";
+"Files are read only between these times, and what changed meanwhile is picked up when they begin. Search works all day." = "Files are read only between these times, and what changed meanwhile is picked up when they begin. Search works all day.";
+"From" = "From";
+"If your network blocks Hugging Face, download the two files on another network and click Use Files… to choose them. DigUp checks them before it uses them." = "If your network blocks Hugging Face, download the two files on another network and click Use Files… to choose them. DigUp checks them before it uses them.";
+"Index only at set hours" = "Index only at set hours";
+"The chosen %1$@ is %2$@, not %3$@" = "The chosen %1$@ is %2$@, not %3$@";
+"The chosen %1$@ isn't the right file" = "The chosen %1$@ isn't the right file";
+"Those aren't the model's files" = "Those aren't the model's files";
+"To" = "To";
+"Use" = "Use";
+"Use Files…" = "Use Files…";
+"indexing from %1$@" = "indexing from %1$@";
+"to" = "to";
diff --git a/Sources/DigUpLocalization/Resources/zh-Hant.lproj/InfoPlist.strings b/Sources/DigUpLocalization/Resources/zh-Hant.lproj/InfoPlist.strings
new file mode 100644
index 00000000..9a15a5be
--- /dev/null
+++ b/Sources/DigUpLocalization/Resources/zh-Hant.lproj/InfoPlist.strings
@@ -0,0 +1,5 @@
+"NSAppleEventsUsageDescription" = "DigUp 會請 QuickTime Player 開啟錄音或影片，並跳到符合搜尋內容的時間點。";
+"NSDesktopFolderUsageDescription" = "DigUp 會為你選擇的資料夾建立索引，讓你依內容描述搜尋檔案。所有內容都留在這台 Mac 上。";
+"NSDocumentsFolderUsageDescription" = "DigUp 會為你選擇的資料夾建立索引，讓你依內容描述搜尋檔案。所有內容都留在這台 Mac 上。";
+"NSDownloadsFolderUsageDescription" = "DigUp 會為你選擇的資料夾建立索引，讓你依內容描述搜尋檔案。所有內容都留在這台 Mac 上。";
+"NSRemovableVolumesUsageDescription" = "DigUp 會為你選擇的資料夾建立索引，讓你依內容描述搜尋檔案。所有內容都留在這台 Mac 上。";
diff --git a/Sources/DigUpLocalization/Resources/zh-Hant.lproj/Localizable.strings b/Sources/DigUpLocalization/Resources/zh-Hant.lproj/Localizable.strings
new file mode 100644
index 00000000..70eed817
--- /dev/null
+++ b/Sources/DigUpLocalization/Resources/zh-Hant.lproj/Localizable.strings
@@ -0,0 +1,427 @@
+/* DigUp interface strings. Positional %@ arguments contain already formatted display values. */
+" (about %1$@ on this Mac)" = "（這台 Mac 約需 %1$@）";
+" (no access)" = "（沒有存取權限）";
+" (not connected)" = "（未連接）";
+" + %1$@ later" = "，稍後另需 %1$@";
+" Long PDFs and documents get their first pages in that time, and the rest " = " 較長的 PDF 與文件會先讀取前幾頁，其餘內容";
+" at %1$@" = "，%1$@";
+" at line %1$@" = "，第 %1$@ 行";
+" in your code" = "，位於程式碼中";
+" of " = "／";
+" · %1$@ long %2$@ to finish" = " · %1$@ 個較長檔案尚未完成";
+" · %1$@ waiting" = " · %1$@ 個待處理";
+" · %1$@ weaker" = " · %1$@ 筆較不相關";
+" · model %1$@" = " · 模型：%1$@";
+" · paused" = " · 已暫停";
+"%.1f h" = "%.1f 小時";
+"%1$@ %2$@ indexed" = "%1$@ 個檔案已建立索引";
+"%1$@ %2$@ indexed yet" = "%1$@ 個檔案尚未建立索引";
+"%1$@ %2$@ waiting" = "%1$@ 個檔案待處理";
+"%1$@ cells" = "%1$@ 個儲存格";
+"%1$@ code %2$@ indexed" = "%1$@ 個程式碼檔案已建立索引";
+"%1$@ code files waiting · %2$@" = "%1$@ 個程式碼檔案待處理 · %2$@";
+"%1$@ couldn't be read" = "%1$@ 個無法讀取";
+"%1$@ files to search in %2$@" = "%2$@ 中有 %1$@ 個檔案可搜尋";
+"%1$@ folders" = "%1$@ 個資料夾";
+"%1$@ lines" = "%1$@ 行";
+"%1$@ long %2$@" = "%1$@ 個較長檔案";
+"%1$@ long %2$@ to finish" = "%1$@ 個較長檔案尚未完成";
+"%1$@ min" = "%1$@ 分鐘";
+"%1$@ of %2$@ files searchable" = "%2$@ 個檔案中，%1$@ 個可搜尋";
+"%1$@ of %2$@ indexed" = "%2$@ 個檔案中，%1$@ 個已建立索引";
+"%1$@ pages" = "%1$@ 頁";
+"%1$@ results" = "%1$@ 筆結果";
+"%1$@ s" = "%1$@ 秒";
+"%1$@ skipped" = "%1$@ 個已略過";
+"%1$@ to be indexed" = "%1$@，等待建立索引";
+"%1$@ waiting" = "%1$@ 個待處理";
+"%1$@ weaker %2$@" = "%1$@ 筆較不相關的結果";
+"%1$@ – playing from " = "%1$@ – 播放起點：";
+"(%1$@). Until then, search finds files by name." = "（%1$@）。在此之前，可依檔名搜尋。";
+"+ %1$@ later" = "稍後另需 %1$@";
+", %1$@ read so far" = "，已讀取 %1$@ 頁";
+", and %1$@ more for long files" = "，較長檔案另需 %1$@";
+", as part of “%1$@”." = "，包含於「%1$@」。";
+"1 cell" = "1 個儲存格";
+"1 line" = "1 行";
+"1 page" = "1 頁";
+"1 result" = "1 筆結果";
+"< 1 s" = "不到 1 秒";
+"A result opens there at the line that matched. Space shows the whole file in Quick Look." = "搜尋結果會在所選 App 中開啟並跳到符合的行。按空白鍵可用「快速查看」預覽整份檔案。";
+"About %1$@" = "約 %1$@";
+"About DigUp" = "關於 DigUp";
+"Add" = "加入";
+"Add Folders" = "加入資料夾";
+"Add Folders…" = "加入資料夾…";
+"Add Folder…" = "加入資料夾…";
+"Add folders to search" = "加入搜尋資料夾";
+"Adds %1$@ of indexing" = "建立索引另需 %1$@";
+"Adds %1$@ of indexing and %2$@" = "建立索引另需 %1$@，使用約 %2$@";
+"All" = "全部";
+"Allow in Settings…" = "在系統設定中允許…";
+"Another app is using %1$@" = "另一個 App 正在使用 %1$@";
+"At %1$@ of %2$@" = "%1$@，總長 %2$@";
+"Audio" = "音訊";
+"Back" = "上一步";
+"Can't create %1$@" = "無法建立 %1$@";
+"Can't open the index" = "無法開啟索引";
+"Can't save the model: %1$@" = "無法儲存模型：%1$@";
+"Can't start indexing" = "無法開始建立索引";
+"Cancel" = "取消";
+"Check Now" = "立即檢查";
+"Check for Updates…" = "檢查更新…";
+"Check for updates automatically" = "自動檢查更新";
+"Check the folders to add" = "勾選要加入的資料夾";
+"Check the folders with your code" = "勾選存放程式碼的資料夾";
+"Checking folders…" = "檢查資料夾中…";
+"Checking the download…" = "檢查下載內容中…";
+"Checking the model download…" = "檢查模型下載中…";
+"Choose Another Folder…" = "選擇其他資料夾…";
+"Choose Code Folders…" = "選擇程式碼資料夾…";
+"Choose Folders to Search…" = "選擇搜尋資料夾…";
+"Choose Folders…" = "選擇資料夾…";
+"Choose among its subfolders" = "選擇子資料夾";
+"Choose at least one folder" = "請至少選擇一個資料夾";
+"Choose folders for DigUp to search." = "選擇要讓 DigUp 搜尋的資料夾。";
+"Choose folders to search" = "選擇搜尋資料夾";
+"Clear" = "清除";
+"Click to change" = "按一下更改";
+"Click to set a shortcut" = "按一下設定快捷鍵";
+"Close" = "關閉";
+"Code" = "程式碼";
+"Code Folders" = "程式碼資料夾";
+"Code folders" = "程式碼資料夾";
+"Code index" = "程式碼索引";
+"Code is read once the model has downloaded" = "模型下載完成後會讀取程式碼";
+"Code search is off" = "程式碼搜尋已關閉";
+"Code search reads source files, notebooks and a repo's own docs. It skips what git ignores, vendored " = "程式碼搜尋會讀取原始碼、筆記本與儲存庫的文件。它會略過 git 忽略的內容、第三方";
+"Code, %1$@, %2$@" = "程式碼，%1$@，%2$@";
+"Code, keys, certificates, hidden folders, app bundles and caches are always skipped." = "程式碼、金鑰、憑證、隱藏資料夾、App 與快取一律略過。";
+"Continue" = "繼續";
+"Copied %1$@" = "已複製 %1$@";
+"Copy" = "複製";
+"Copy Path" = "複製路徑";
+"Copy the file, to paste anywhere" = "複製檔案，可貼到其他地方";
+"Couldn't look inside it; it can still be searched." = "無法檢視內部內容，仍可納入搜尋。";
+"Cut" = "剪下";
+"Describe it. Dig it up." = "說出印象，找出檔案。";
+"Describe it: “payment error screenshot”, “zebra in a video”…" = "描述你要找的內容，例如「付款錯誤截圖」、「影片中的斑馬」…";
+"Describe it: “receipt from the hardware store”, “zebra in a video”…" = "描述你要找的內容，例如「五金行收據」、「影片中的斑馬」…";
+"Describe it: “zebra in a video”, “code: retry with backoff”…" = "描述你要找的內容，例如「影片中的斑馬」、「code: 逐次延長等待時間後重試」…";
+"Describe the code: “retry a request with backoff”, a name in it…" = "描述程式碼，例如「逐次延長等待時間後重試請求」，或輸入其中的名稱…";
+"DigUp %1$@ is available" = "DigUp %1$@ 已推出";
+"DigUp can find code by what it does, in the folders you pick. Code gets an index of its own " = "DigUp 可依功能描述尋找所選資料夾中的程式碼。程式碼使用獨立索引，";
+"DigUp can find code by what it does, in the folders you pick. Code gets an index of its own and " = "DigUp 可依功能描述尋找所選資料夾中的程式碼。程式碼使用獨立索引，";
+"DigUp can find code by what it does: type code: in the search panel, as in " = "DigUp 可依功能描述尋找程式碼：在搜尋面板輸入 code:，例如";
+"DigUp is reading your folders%1$@, newest files first. You can search right away; " = "DigUp 正在讀取資料夾%1$@，優先處理最新檔案。你可以立即搜尋；";
+"DigUp lives in the menu bar, which shows how indexing is going." = "DigUp 常駐選單列，並顯示索引建立進度。";
+"DigUp only looks where you tell it to." = "DigUp 只搜尋你指定的資料夾。";
+"DigUp only reads files: it never changes, moves or uploads them." = "DigUp 只讀取檔案，不會修改、移動或上傳。";
+"DigUp only reads pictures, PDFs, documents (txt, md, rtf, docx, odt, html), audio and video here; " = "DigUp 在這裡只讀取圖片、PDF、文件（txt、md、rtf、docx、odt、html）、音訊與影片；";
+"DigUp only searches the folders you pick." = "DigUp 只搜尋你選擇的資料夾。";
+"DigUp reads a new folder once, then keeps up with what changes in it. " = "DigUp 首次讀取新資料夾的完整內容，之後持續處理其中的變更。";
+"DigUp reads each once, then what changes. Code is searched on its own: type " = "DigUp 首次讀取完整內容，之後只處理變更。程式碼獨立搜尋：請在搜尋面板輸入";
+"DigUp reads the folders you choose and keeps what it learns in its index, on this Mac. " = "DigUp 讀取你選擇的資料夾，並將索引儲存在這台 Mac 上。";
+"DigUp starts reading your folders%1$@ once the model has downloaded " = "模型下載完成後，DigUp 會開始讀取資料夾%1$@";
+"Document" = "文件";
+"Documents" = "文件";
+"Done" = "完成";
+"Download" = "下載";
+"Download the Model" = "下載模型";
+"Downloaded" = "已下載";
+"Downloading model · %1$@%%" = "下載模型中 · %1$@%%";
+"Downloading the model · %1$@" = "下載模型中 · %1$@";
+"Downloading the model · %1$@%%" = "下載模型中 · %1$@%%";
+"Edit" = "編輯";
+"EmbeddingGemma 2 by Google (Apache 2.0), run by llama.cpp (MIT)." = "Google 的 EmbeddingGemma 2（Apache 2.0），由 llama.cpp（MIT）執行。";
+"Esc cancels" = "按 Esc 取消";
+"Everything is indexed and searched on this Mac. DigUp downloads its AI model (865 MB) once; " = "所有索引與搜尋都在這台 Mac 上進行。DigUp 只需下載一次 AI 模型（865 MB）；";
+"Extensions" = "副檔名";
+"File" = "檔案";
+"File types" = "檔案類型";
+"Find code by what it does, or by a name in it: type code: in the search panel, as in " = "依功能描述或名稱尋找程式碼：在搜尋面板輸入 code:，例如";
+"Finder's search window uses %1$@" = "Finder 搜尋視窗已使用 %1$@";
+"First pass: about %1$@" = "首次建立索引：約 %1$@";
+"Folders" = "資料夾";
+"Folders and indexing" = "資料夾與索引";
+"Folders to search" = "搜尋範圍";
+"General" = "一般";
+"Get Started" = "開始使用";
+"Has your words" = "包含搜尋文字";
+"Hide DigUp" = "隱藏 DigUp";
+"Hide Preview" = "隱藏預覽";
+"Hide its subfolders" = "隱藏子資料夾";
+"Hide the subfolders of %1$@" = "隱藏 %1$@ 的子資料夾";
+"How long reading this code takes, once, and about how much room its index needs. After " = "首次讀取程式碼所需的時間，以及索引的預估使用空間。";
+"Hugging Face answered %1$@" = "Hugging Face 回傳狀態碼 %1$@";
+"IN THE SEARCH PANEL" = "在搜尋面板中";
+"Image" = "圖片";
+"Images" = "圖片";
+"In " = "搜尋範圍：";
+"Index" = "索引";
+"Index on battery power" = "使用電池時建立索引";
+"Indexing %1$@%%" = "建立索引中 %1$@%%";
+"Indexing %1$@%% · %2$@ of %3$@" = "建立索引中 %1$@%% · %2$@／%3$@";
+"Indexing code %1$@%% · %2$@ of %3$@" = "建立程式碼索引中 %1$@%% · %2$@／%3$@";
+"Indexing paused" = "索引建立已暫停";
+"Indexing stopped" = "索引建立已停止";
+"It goes online only to download its model, once, and to check for updates (General), " = "只有首次下載模型與檢查更新時才會連線（可在「一般」中設定），";
+"It skips what git ignores, vendored and generated code, data files, and anything that looks " = "它會略過 git 忽略的檔案、第三方與自動產生的程式碼、資料檔，以及看起來";
+"Its %1$@ code files leave the code index." = "其中的 %1$@ 個程式碼檔案將移出索引。";
+"Its %1$@ files leave the index. Adding it back later indexes them " = "其中的 %1$@ 個檔案將移出索引。日後重新加入時，會";
+"Kept for when it's back" = "保留索引，等待重新連接";
+"Location" = "位置";
+"Looking at the folders…" = "檢查資料夾中…";
+"Looking at your code…" = "檢查程式碼中…";
+"Looking at your folders…" = "檢查資料夾中…";
+"Low Power Mode" = "低耗電模式";
+"Mac is warm" = "Mac 溫度偏高";
+"Matches %1$@" = "%1$@ 符合";
+"Matches its name" = "檔名符合";
+"Matches its text" = "文字內容符合";
+"Matches the frame at %1$@" = "%1$@ 的畫面符合";
+"Matches the picture" = "圖片內容符合";
+"Matches the sound at %1$@" = "%1$@ 的聲音符合";
+"Matches the text in it" = "其中的文字符合";
+"Matches the text on %1$@" = "%1$@ 的文字符合";
+"Matches what's heard at %1$@" = "%1$@ 的音訊內容符合";
+"Matches what's on screen" = "螢幕內容符合";
+"Matching words only until the model has downloaded (%1$@%%)" = "模型下載完成前僅比對文字（%1$@%%）";
+"Matching words only: the model isn't downloaded" = "僅比對文字：尚未下載模型";
+"Matching words; meaning search is warming up…" = "比對文字中；語意搜尋正在準備…";
+"Matching words…" = "比對文字中…";
+"Minimize" = "縮小";
+"Model" = "模型";
+"Model download: waiting for the network" = "模型下載：等待網路連線";
+"Model not downloaded" = "尚未下載模型";
+"Model ready" = "模型已就緒";
+"Moments inside audio and video" = "音訊與影片中的片段";
+"Needs %1$@ free on this disk" = "此磁碟需要 %1$@ 可用空間";
+"New Search" = "新增搜尋";
+"No access" = "沒有存取權限";
+"No code folders yet. Add the folders that hold your projects." = "尚未加入程式碼資料夾。請加入存放專案的資料夾。";
+"No code here" = "這裡沒有程式碼";
+"No folders chosen yet" = "尚未選擇資料夾";
+"No folders yet. Add the ones DigUp should search." = "尚未加入資料夾。請加入要讓 DigUp 搜尋的資料夾。";
+"No good matches" = "找不到相關結果";
+"No good matches for “%1$@”" = "找不到與「%1$@」相關的結果";
+"No good matches in your code" = "找不到相關的程式碼";
+"None. Code projects, app bundles and caches are skipped anyway (code has its own tab)." = "無。程式專案、App 與快取一律略過；程式碼請在專用分頁設定。";
+"Not connected" = "未連接";
+"Not downloaded yet" = "尚未下載";
+"Nothing to search here yet" = "目前沒有可搜尋的內容";
+"Nothing to search in the subfolders checked" = "勾選的子資料夾沒有可搜尋的內容";
+"Off unless you turn it on." = "需自行啟用，預設關閉。";
+"Once a day DigUp asks GitHub for its newest version; nothing about your files is sent. " = "DigUp 每天向 GitHub 檢查一次新版本，不會傳送你的檔案資訊。";
+"Open" = "開啟";
+"Open DigUp" = "開啟 DigUp";
+"Open DigUp from anywhere" = "隨時開啟 DigUp";
+"Open DigUp when you log in" = "登入時開啟 DigUp";
+"Open a folder to pick some of its subfolders." = "展開資料夾可選取部分子資料夾。";
+"Open at %1$@" = "從 %1$@ 開啟";
+"Open code in" = "開啟程式碼的 App";
+"Open in %1$@" = "在 %1$@ 中開啟";
+"Open the file" = "開啟檔案";
+"Open them in the DigUp window (⌘O shows everything)" = "在 DigUp 視窗中開啟（⌘O 顯示全部結果）";
+"Opens the search panel from any app." = "在任何 App 中開啟搜尋面板。";
+"PDFs" = "PDF";
+"PDFs and documents" = "PDF 與文件";
+"Part %1$@ of %2$@" = "第 %1$@ 部分，共 %2$@ 部分";
+"Paste" = "貼上";
+"Pause" = "暫停";
+"Pause Indexing" = "暫停建立索引";
+"Paused · %1$@" = "已暫停 · %1$@";
+"Paused · %1$@ code files waiting" = "已暫停 · %1$@ 個程式碼檔案待處理";
+"Pick folders, or open one to pick some of its subfolders. You can change this " = "選擇資料夾，也可展開後只選取部分子資料夾。你可以";
+"Pick the folders it should search." = "選擇要搜尋的資料夾。";
+"Pick the folders that hold your projects; open one to pick among its repos. " = "選擇存放專案的資料夾，也可展開後選取其中的儲存庫。";
+"Play" = "播放";
+"Play from %1$@" = "從 %1$@ 播放";
+"Press the new shortcut…" = "請按下新的快捷鍵…";
+"Press the shortcut in any app, describe what you're looking for, and press Return." = "在任何 App 中按下快捷鍵，描述要找的內容，再按 Return。";
+"Privacy" = "隱私";
+"Quick Look, after arrowing to a result" = "用方向鍵選取結果後，開啟「快速查看」";
+"Quit DigUp" = "結束 DigUp";
+"Reading the rest of %1$@ · %2$@%%" = "讀取 %1$@ 的剩餘內容 · %2$@%%";
+"Ready" = "已就緒";
+"Recording a new shortcut" = "等待輸入新快捷鍵";
+"Redo" = "重做";
+"Remove" = "移除";
+"Remove %1$@" = "移除 %1$@";
+"Resume" = "繼續";
+"Resume Indexing" = "繼續建立索引";
+"Say what the code does, or type a name that's in it." = "描述程式碼的功能，或輸入其中的名稱。";
+"Screenshot" = "截圖";
+"Screenshots" = "截圖";
+"Screenshots and photos" = "截圖與照片";
+"Screenshots use %1$@" = "螢幕截圖已使用 %1$@";
+"Search" = "搜尋";
+"Search for “%1$@”" = "搜尋「%1$@」";
+"Search my code" = "搜尋我的程式碼";
+"Search panel open" = "搜尋面板已開啟";
+"Search shortcut" = "搜尋快捷鍵";
+"Search this folder again" = "重新納入搜尋範圍";
+"Search your code" = "搜尋你的程式碼";
+"Search your code too?" = "也要搜尋程式碼嗎？";
+"Searching your code" = "搜尋程式碼中";
+"Searching…" = "搜尋中…";
+"Search…" = "搜尋…";
+"See what's new and update" = "查看新版內容並更新";
+"Select All" = "全選";
+"Settings (⌘,)" = "設定（⌘,）";
+"Settings…" = "設定…";
+"Shortcut %1$@, click to change" = "快捷鍵 %1$@，按一下更改";
+"Show %1$@ more" = "再顯示 %1$@ 個";
+"Show Preview" = "顯示預覽";
+"Show all %1$@ %2$@…" = "顯示全部 %1$@ 筆%1$@…";
+"Show in Finder" = "在 Finder 中顯示";
+"Show it in Finder" = "在 Finder 中顯示";
+"Show the subfolders of %1$@" = "顯示 %1$@ 的子資料夾";
+"Size on disk" = "磁碟使用量";
+"Skip" = "略過";
+"Skip a Folder…" = "略過資料夾…";
+"Skip some folders or file types" = "略過部分資料夾或檔案類型";
+"Skip these file types" = "略過這些檔案類型";
+"Skip these folders" = "略過這些資料夾";
+"So the shortcut always works." = "讓快捷鍵隨時可用。";
+"Spotlight uses %1$@" = "Spotlight 已使用 %1$@";
+"Starting…" = "啟動中…";
+"Status" = "狀態";
+"Step %1$@ of %2$@" = "第 %1$@ 步，共 %2$@ 步";
+"Still indexing (%1$@%%): some files aren't in yet" = "仍在建立索引（%1$@%%）：部分檔案尚未納入";
+"Still reading code (%1$@%%): some isn't in yet" = "仍在讀取程式碼（%1$@%%）：部分尚未納入";
+"Stop searching the code in “%1$@”?" = "要停止搜尋「%1$@」中的程式碼嗎？";
+"Stop searching this folder" = "停止搜尋此資料夾";
+"Stop searching “%1$@”?" = "要停止搜尋「%1$@」嗎？";
+"Storage" = "儲存空間";
+"Switching input sources uses %1$@" = "切換輸入法已使用 %1$@";
+"TRY" = "試試看";
+"That's it. It works from any app." = "就這麼簡單，在任何 App 中都能使用。";
+"The code index (%1$@) is deleted. Turning it on again reads the code again." = "將刪除程式碼索引（%1$@）。再次啟用時會重新讀取程式碼。";
+"The code index keeps your code's text on this Mac, as the main index keeps your documents'. " = "程式碼索引將程式文字儲存在這台 Mac 上，與文件索引相同。";
+"The download couldn't resume" = "無法續傳下載";
+"The download stopped early" = "下載提前中止";
+"The download was damaged twice. Try again later." = "下載內容連續兩次損毀，請稍後再試。";
+"The emoji picker uses %1$@" = "表情符號選擇器已使用 %1$@";
+"The file's default app" = "檔案的預設 App";
+"The first pass takes this long. Long PDFs and documents get their first pages in it, " = "首次建立索引所需的時間。較長的 PDF 與文件會先讀取前幾頁，";
+"The model isn't downloaded yet" = "尚未下載模型";
+"They match much less well than the results above. Press Return to " = "這些結果比上方結果的相關性低。按 Return 可";
+"Try Again" = "再試一次";
+"Try describing what's in it: what you'd see or hear, or words you remember." = "試著描述其中的畫面、聲音，或你記得的文字。";
+"Try it now: press %1$@." = "現在試試看：按下 %1$@。";
+"Try saying what the code does, or a name that's in it." = "試著描述程式碼的功能，或輸入其中的名稱。";
+"Try what you'd see or hear in it, or words you remember from it." = "試著描述其中的畫面、聲音，或你記得的文字。";
+"Turn Off" = "關閉";
+"Turn Off Code Search…" = "關閉程式碼搜尋…";
+"Turn off code search?" = "要關閉程式碼搜尋嗎？";
+"Type what you remember in the search field above: what's in it, what it looks or sounds like, or " = "在上方搜尋欄輸入你記得的內容：裡面有什麼、畫面或聲音，或是";
+"Under a second" = "不到一秒";
+"Undo" = "復原";
+"Update to DigUp %1$@…" = "更新至 DigUp %1$@…";
+"Updates install with one click." = "按一下即可安裝更新。";
+"Use ⌘, ⌥ or ⌃ with a key" = "請搭配 ⌘、⌥ 或 ⌃ 與其他按鍵";
+"Video" = "影片";
+"Waiting for a network connection" = "等待網路連線";
+"Waiting for the network…" = "等待網路連線…";
+"Weaker matches" = "較不相關的結果";
+"Welcome to DigUp" = "歡迎使用 DigUp";
+"What should DigUp search?" = "要讓 DigUp 搜尋哪些資料夾？";
+"When it's off, a folder's first pass waits for a charger. New files always go in right away." = "關閉時，首次建立資料夾索引會等到接上電源。新增檔案仍會立即納入索引。";
+"Window" = "視窗";
+"Words only: meaning search isn't available" = "僅比對文字：語意搜尋目前無法使用";
+"You're all set" = "設定完成";
+"a dog on the beach" = "沙灘上的狗";
+"a page" = "頁面";
+"a screenshot of an error message" = "錯誤訊息截圖";
+"about %1$@" = "約 %1$@";
+"about %1$@ left" = "約剩 %1$@";
+"after that it works offline, and nothing you index ever leaves your Mac." = "之後即可離線使用，索引內容不會離開你的 Mac。";
+"afterwards (about %1$@ more)." = "稍後再讀取（另需約 %1$@）。";
+"again." = "重新建立索引。";
+"and generated code, data files, and anything that looks like a key or a password." = "與自動產生的程式碼、資料檔，以及看起來像金鑰或密碼的內容。";
+"and never shows up in other searches." = "不會出現在其他搜尋結果中。";
+"and the rest afterwards, once everything else is in." = "待其他檔案完成後，再讀取剩餘內容。";
+"anytime in Settings." = "隨時在「設定」中調整。";
+"audio file" = "音訊檔案";
+"audio files" = "音訊檔案";
+"cell %1$@" = "第 %1$@ 個儲存格";
+"cells %1$@–%2$@" = "第 %1$@–%2$@ 個儲存格";
+"code file" = "程式碼檔案";
+"code files" = "程式碼檔案";
+"code is read only in the code folders (the Code tab). Keys, certificates and password files are " = "程式碼只在「程式碼」分頁所選的資料夾中讀取。金鑰、憑證與密碼檔案";
+"code: in the search panel." = "code:。";
+"code: parse the command line options" = "code: 解析命令列選項";
+"code: retry a request with backoff" = "code: 逐次延長等待時間後重試請求";
+"code: where the settings are saved" = "code: 設定儲存在哪裡";
+"document" = "文件";
+"documents" = "文件";
+"e.g. heic, txt" = "例如 heic、txt";
+"fold them away." = "收合。";
+"image" = "圖片";
+"images" = "圖片";
+"in %1$@" = "搜尋範圍：%1$@";
+"less than a minute left" = "剩餘不到一分鐘";
+"like a key or a password." = "像金鑰或密碼的內容。";
+"line %1$@" = "第 %1$@ 行";
+"lines %1$@–%2$@" = "第 %1$@–%2$@ 行";
+"long files" = "較長檔案";
+"macOS isn't letting DigUp read it." = "macOS 尚未允許 DigUp 讀取此資料夾。";
+"macOS uses %1$@ for one of its shortcuts" = "macOS 已將 %1$@ 用於系統快捷鍵";
+"macOS will ask before DigUp can read folders like Desktop, Documents and Downloads. " = "讀取「桌面」、「文件」、「下載項目」等資料夾前，macOS 會先詢問你的許可。";
+"never read, nor are hidden folders like ~/.ssh." = "以及 ~/.ssh 等隱藏資料夾一律不讀取。";
+"never shows up in other searches." = "不會出現在其他搜尋結果中。";
+"on battery" = "使用電池中";
+"opens DigUp from any app" = "在任何 App 中開啟 DigUp";
+"other searches." = "其他搜尋結果中。";
+"p. %1$@" = "第 %1$@ 頁";
+"page %1$@" = "第 %1$@ 頁";
+"partly read so far" = "已讀取部分內容";
+"results fill in as it goes." = "結果會隨進度逐漸增加。";
+"screenshot" = "截圖";
+"screenshots" = "截圖";
+"searches. You can turn it on later in Settings → Code." = "搜尋結果中。你也可以稍後在「設定 → 程式碼」中啟用。";
+"show them." = "展開。";
+"slides about the budget" = "預算相關簡報";
+"someone laughing" = "有人在笑";
+"that, only what changes is read again." = "之後只會重新讀取變更的內容。";
+"under a second" = "不到一秒";
+"video" = "影片";
+"videos" = "影片";
+"which sends nothing about your files." = "不會傳送你的檔案資訊。";
+"whiteboard notes" = "白板筆記";
+"words from it." = "其中的文字。";
+"“%1$@” is searched already" = "「%1$@」已在搜尋範圍中";
+"“%1$@” isn't searched anyway." = "「%1$@」原本就不在搜尋範圍中。";
+"“code: retry with backoff”. Code has an index of its own, and it never shows up in " = "「code: 逐次延長等待時間後重試」。程式碼使用獨立索引，不會出現在";
+"“code: retry with backoff”. It gets an index of its own and never shows up in other " = "「code: 逐次延長等待時間後重試」。它使用獨立索引，不會出現在其他";
+"“that payment error”, “the zebra”, “whiteboard from Tuesday”" = "「付款錯誤」、「斑馬」、「星期二的白板」";
+"“the clause about pets in the lease”, “flight receipt”" = "「租約裡的寵物條款」、「機票收據」";
+"“where they talk about sleep”, “the part with the drums”" = "「談到睡眠的地方」、「有鼓聲的片段」";
+"↩ %1$@   ⌘↩ Reveal   ␣ Quick Look%2$@   ⌘C Copy" = "↩ %1$@   ⌘↩ 顯示位置   ␣ 快速查看%2$@   ⌘C 複製";
+"↩ %1$@%2$@   ⌘↩ Reveal   ␣ Quick Look   ⌘C Copy" = "↩ %1$@%2$@   ⌘↩ 顯示位置   ␣ 快速查看   ⌘C 複製";
+"⚠︎ The model download stopped" = "⚠︎ 模型下載已停止";
+"the code" = "程式碼";
+"none" = "未設定";
+
+/* Added in DigUp 0.6.1. */
+" and " = " 和 ";
+"%1$@ %2$@ indexed · %3$@" = "已為 %1$@ 個檔案建立索引 · %3$@";
+"%1$@ code %2$@ waiting · read after your other files" = "%1$@ 個程式碼檔案等待中 · 將在其他檔案處理完成後讀取";
+"%1$@ code files waiting · indexing from %2$@" = "%1$@ 個程式碼檔案等待中 · 將於 %2$@ 開始建立索引";
+"Choose the model files you downloaded: %1$@." = "請選取已下載的模型檔案：%1$@。";
+"Copies the addresses of the two files" = "複製這兩個檔案的下載網址";
+"Copy Links" = "複製連結";
+"Downloaded the model's two files somewhere else? Choose them here." = "已從其他地方下載模型的兩個檔案？請在這裡選取。";
+"Files are read only between these times, and what changed meanwhile is picked up when they begin. Search works all day." = "只在指定時段讀取檔案，期間發生的變更會在時段開始後處理。搜尋功能全天都可使用。";
+"From" = "從";
+"If your network blocks Hugging Face, download the two files on another network and click Use Files… to choose them. DigUp checks them before it uses them." = "如果目前的網路封鎖 Hugging Face，請透過其他網路下載這兩個檔案，再按「使用檔案…」選取。DigUp 會先驗證檔案，再開始使用。";
+"Index only at set hours" = "只在指定時段建立索引";
+"The chosen %1$@ is %2$@, not %3$@" = "選取的 %1$@ 大小為 %2$@，應為 %3$@";
+"The chosen %1$@ isn't the right file" = "選取的 %1$@ 不是正確的檔案";
+"Those aren't the model's files" = "選取的檔案不是模型檔案";
+"To" = "結束時間";
+"Use" = "使用";
+"Use Files…" = "使用檔案…";
+"indexing from %1$@" = "將於 %1$@ 開始建立索引";
+"to" = "至";
diff --git a/Tests/DigUpLocalizationTests/LocalizationTests.swift b/Tests/DigUpLocalizationTests/LocalizationTests.swift
new file mode 100644
index 00000000..6bea0a09
--- /dev/null
+++ b/Tests/DigUpLocalizationTests/LocalizationTests.swift
@@ -0,0 +1,96 @@
+import Foundation
+import Testing
+@testable import DigUpLocalization
+
+struct LocalizationTests {
+    @Test func taiwanLanguageSelectsTraditionalChineseAndUnsupportedLanguagesFallBack() throws {
+        let available = ["en", "zh-Hant"]
+        for preference in ["zh-TW", "zh-Hant", "zh-Hant-TW"] {
+            let selected = try #require(Bundle.preferredLocalizations(from: available, forPreferences: [preference]).first)
+            #expect(selected == "zh-Hant", "preference: \(preference)")
+            #expect(try localizedBundle(selected).localizedString(forKey: "Settings…", value: nil, table: nil) == "設定…")
+        }
+        let fallback = try #require(Bundle.preferredLocalizations(from: available, forPreferences: ["fr"]).first)
+        #expect(fallback == "en")
+        #expect(try localizedBundle(fallback).localizedString(forKey: "Settings…", value: nil, table: nil) == "Settings…")
+    }
+
+    private func localizedBundle(_ language: String) throws -> Bundle {
+        let path = try #require(L10n.bundle.path(forResource: language, ofType: "lproj"))
+        return try #require(Bundle(path: path))
+    }
+
+    private func strings(_ language: String) throws -> [String: String] {
+        let bundle = try localizedBundle(language)
+        let url = try #require(bundle.url(forResource: "Localizable", withExtension: "strings"))
+        return try #require(PropertyListSerialization.propertyList(from: Data(contentsOf: url), format: nil) as? [String: String])
+    }
+
+    @Test func languagesHaveTheSameKeysAndEnglishFallsBackToItsKeys() throws {
+        let english = try strings("en")
+        let chinese = try strings("zh-Hant")
+        #expect(english.count > 350)
+        #expect(Set(english.keys) == Set(chinese.keys))
+        for (key, value) in english { #expect(key == value) }
+        #expect(chinese.values.allSatisfy { !$0.isEmpty })
+        #expect(L10n.text("missing.translation.key") == "missing.translation.key")
+    }
+
+    @Test func translatedFormatsUseOnlyExistingArguments() throws {
+        let english = try strings("en")
+        let chinese = try strings("zh-Hant")
+        let pattern = try NSRegularExpression(pattern: #"%(\d+)\$@"#)
+        func arguments(_ value: String) -> Set<String> {
+            Set(pattern.matches(in: value, range: NSRange(value.startIndex..., in: value)).map {
+                (value as NSString).substring(with: $0.range(at: 1))
+            })
+        }
+        for (key, value) in chinese {
+            let translatedArguments = arguments(value)
+            let originalArguments = arguments(english[key]!)
+            #expect(translatedArguments.isSubset(of: originalArguments))
+            if let count = originalArguments.compactMap(Int.init).max() {
+                let values: [CVarArg] = (1...count).map { "⟦\($0)⟧" }
+                let formatted = String(format: value, arguments: values)
+                for argument in translatedArguments { #expect(formatted.contains("⟦\(argument)⟧")) }
+            }
+        }
+    }
+
+    @Test func dynamicValuesAndLiteralPercentSurviveTranslation() throws {
+        let english = try localizedBundle("en")
+        let chinese = try localizedBundle("zh-Hant")
+        let key = "Indexing %1$@%% · %2$@ of %3$@"
+        let args: [CVarArg] = ["42", "21", "50"]
+        #expect(String(format: english.localizedString(forKey: key, value: nil, table: nil), arguments: args)
+                == "Indexing 42% · 21 of 50")
+        #expect(String(format: chinese.localizedString(forKey: key, value: nil, table: nil), arguments: args)
+                == "建立索引中 42% · 21／50")
+        #expect(chinese.localizedString(forKey: "Settings…", value: nil, table: nil) == "設定…")
+    }
+
+    @Test func scheduledIndexingAndManualModelFilesKeepDisplayValues() throws {
+        let bundle = try localizedBundle("zh-Hant")
+        func format(_ key: String, _ args: CVarArg...) -> String {
+            String(format: bundle.localizedString(forKey: key, value: nil, table: nil), arguments: args)
+        }
+        #expect(format("%1$@ code files waiting · indexing from %2$@", "12", "01:00")
+                == "12 個程式碼檔案等待中 · 將於 01:00 開始建立索引")
+        #expect(format("%1$@ %2$@ indexed · %3$@", "42", "files", "將於 01:00 開始建立索引")
+                == "已為 42 個檔案建立索引 · 將於 01:00 開始建立索引")
+        #expect(format("The chosen %1$@ is %2$@, not %3$@", "model.gguf", "10 MB", "865 MB")
+                == "選取的 model.gguf 大小為 10 MB，應為 865 MB")
+        #expect(bundle.localizedString(forKey: "Index only at set hours", value: nil, table: nil)
+                == "只在指定時段建立索引")
+        #expect(bundle.localizedString(forKey: "Use Files…", value: nil, table: nil) == "使用檔案…")
+    }
+
+    @Test func permissionDescriptionsAreLocalized() throws {
+        for language in ["en", "zh-Hant"] {
+            let bundle = try localizedBundle(language)
+            let value = bundle.localizedString(forKey: "NSDocumentsFolderUsageDescription", value: nil, table: "InfoPlist")
+            #expect(value.contains("DigUp"))
+            #expect(value != "NSDocumentsFolderUsageDescription")
+        }
+    }
+}
diff --git a/build.sh b/build.sh
index a4e94ad9..95b4080f 100755
--- a/build.sh
+++ b/build.sh
@@ -46,6 +46,14 @@ xcrun actool --compile "$APP/Contents/Resources" --platform macosx --target-devi
 cp "$ICON" "$APP/Contents/Resources/AppIcon.icns"   # over actool's plainer fallback: ours has simplified 16 and 32 px
 cp Resources/Acknowledgements.txt "$APP/Contents/Resources/Acknowledgements.txt"
 
+# SwiftPM's localization bundle and main-bundle permission descriptions.
+ditto "$BIN_DIR/DigUp_DigUpLocalization.bundle" "$APP/Contents/Resources/DigUp_DigUpLocalization.bundle"
+for localization in Sources/DigUpLocalization/Resources/*.lproj; do
+  language="$(basename "$localization")"
+  mkdir -p "$APP/Contents/Resources/$language"
+  cp "$localization/InfoPlist.strings" "$APP/Contents/Resources/$language/InfoPlist.strings"
+done
+
 # Sparkle (in-app updates): the framework in Frameworks/, where the app's runpath looks. Its XPC services are for
 # sandboxed apps and its headers for building against it: left out.
 FW="$APP/Contents/Frameworks/Sparkle.framework"
diff --git a/docs/localization.md b/docs/localization.md
new file mode 100644
index 00000000..53adc6e3
--- /dev/null
+++ b/docs/localization.md
@@ -0,0 +1,62 @@
+# Interface localization
+
+DigUp follows the language selected for the app in macOS, with English as its development language and fallback.
+Traditional Chinese uses `zh-Hant`, including the system's `zh-TW` preference.
+
+The `DigUpLocalization` target contains `L10n` and these resources:
+
+```
+Sources/DigUpLocalization/Resources/
+├── en.lproj/       Localizable.strings, InfoPlist.strings
+└── zh-Hant.lproj/  Localizable.strings, InfoPlist.strings
+```
+
+`L10n.text` looks up static interface text. `L10n.format` formats display values with positional `%1$@`, `%2$@`, etc.
+The English format is also the lookup key. Pass already formatted strings (for example a count's `.formatted()` value),
+and escape a literal percent as `%%` in format strings. Translations may reorder or omit an argument; Chinese need not
+include an English singular/plural noun supplied by the calling code. Keep both English noun forms for existing English
+plural behavior. `String(format:)` duration formats such as `%.1f h` are translated before their existing formatting call.
+
+To add a language, add its `.lproj` directory with both files and the same interface keys. Keep permission descriptions
+consistent with the English Info.plist. Run `swift test`, build with `./build.sh`, and inspect the packaged app's UI in
+both languages, including long explanatory text and strings with counts, percent signs, and file names.
+
+`build.sh` embeds the SwiftPM resource bundle in `Contents/Resources`. It also copies each language's `InfoPlist.strings`
+into the main app bundle so macOS can localize its permission prompts. This step matters: launching from the build
+folder alone does not prove that the distributed `.app` includes its translations.
+
+Search terms, tokenizer behavior, model prompts, file paths, stored settings keys, helper commands and diagnostics are
+not localized. Sample queries shown in the UI may be translated; they are examples, not changes to search processing.
+System error descriptions and third-party UI use the localization supplied by macOS or the dependency.
+
+## Example: the same build in two languages
+
+| English | Traditional Chinese |
+| --- | --- |
+| ![English General settings](localization/en-general.png) | ![Traditional Chinese General settings](localization/zh-Hant-general.png) |
+
+
+## DigUp 0.6.1 coverage
+
+The localized UI includes indexing hours, the next indexing time, code waiting for other files, and manual model-file
+selection (including file-size/check errors). The same build continues to use English for unsupported languages.
+
+| English indexing hours | Traditional Chinese indexing hours |
+| --- | --- |
+| ![English indexing hours](localization/en-folders.png) | ![Traditional Chinese indexing hours](localization/zh-Hant-folders.png) |
+
+Validation on macOS: 97 tests passed (86 DigUpKit, 6 LlamaRuntime including reference vectors, 5 localization),
+`./build.sh` and strict deep signature verification passed. Fourteen isolated packaged-app runs checked onboarding,
+General/Folders/Code/Storage settings and search in English and `zh-TW`, plus `zh-Hant` scheduling and unsupported
+French fallback. Permission descriptions were verified as packaged resources; live macOS permission dialogs were
+not triggered. Helper/system error messages use their existing source language when they have no UI translation.
+
+## Independent regression coverage (2026-10-20)
+
+The localization tests also check that `zh-TW`, `zh-Hant`, and `zh-Hant-TW` select the Traditional Chinese resources,
+and that an unsupported French preference selects the English resources and wording. These are resource-selection
+tests, not a new packaged-app UI run.
+
+PR #112 already proposes the repeated Traditional Chinese result-count correction, receipt example localization,
+and localization checker scripts. Those changes remain in #112 rather than being copied into this PR update.
+Han filename and body search changes remain outside this localization PR.
diff --git a/docs/localization/en-folders.png b/docs/localization/en-folders.png
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