Add text in HTML for signup errors
Add text in HTML for signup errors

partial resolution for issue #221

Doesn't solve the translation of bad usernames, but it will display
the error in english.

Signed-off-by: Gary O'Neall <f9023000f29773649f3850298becb9544b5fd6a9@sourceauditor.com>

OpenChain-Project/Online-Self-Certification-Web-App,OpenChain-Project/Online-Self-Certification-Web-App,OpenChain-Project/Online-Self-Certification-Web-App