[Request] Custom error message

[ed-ponce]

It would be neat if you pass a custom error message right from the CLI arguments.

Something like --error-message 'Try again!' that could be referenced in the HTML template as {error_message}.

[robinmoisson]

Yeah that's in line with the other params, I'll add this in October when I can get a little time to work on that project. Thanks for the suggestion!