Finish internationalizing Bureaucromancy

Internationalize form validation.

Document & add missing files.

Integrate & fix error messages; TODO: Block invalid submits

Add file-input support, upload missing files.

Add (partial) support image buttons.

Reorganize keyboard templates.

Render onscreen keyboards (not interactive yet).

Render <select> elements to multi-column menus.

Implement radio inputs, upload missing files, make space for descriptions & richer form controls to use.