change validation to be better for client side-->

[todo]

https://github.com/ImageWare/TLSential/blob/6744181184037fb0d0a1ff29309a5f50a2065d7f/ui/templates/create_certificate.html#L50-L55

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This issue was generated by todo based on a TODO comment in 6744181 when #86 was merged. cc @imageware.

[d1str0]

UI needs some fixes to look better. Could use JS to validate before submission, or just render errors returned prettier on reload.