Username containing spaces gives errors later in registration

[cephos]

When you register with a Username with spaces, you get the normal Password-Setting Email but the Space in the URL isn't escaped (%20). If you replace it manually and try to set the password there is an error which says: "Something wrong happened" without further details.

Two possibilities to fix:

1. Block spaces in Form-Validation right away from the start (preferred and probably easier)
2. Fix these two bugs and eventually following bugs

Affected Release: Version which is currently installed on http://blue.publications.li/

[satabin]

Forbidding space in the form is probably the best solution at first.

@monperrus Can you see anything in the logs?

@tdurieux Is this ok for you to do it?

[tdurieux]

I will do it.