Investigate validations for username strings

[marcellamaki]

Observed behavior

Reported from Lewa in Clearinghouse: some users have names that have apostrophes. Kolibri doesn't allow such characters in the username part.

Expected behavior

Apostrophes should be a permitted character within names unless there

User-facing consequences

Usernames do not align to users' actual names.

Steps to reproduce

Create a user name that contains an ' in Kolibri

[jredrejo]

I've never seen usernames like that. For the full name it makes sense, but for the username... I am not sure if that's a good idea. I can imagine also problems in our api with json objects containing the usename