- Try to fix OAuth2: Change oidc username to preferred_username.
- Try to fix OAuth2: Change oidc username to preferred_username.

Thanks to xet7 !

wekan/wekan,wekan/wekan,GhassenRjab/wekan,libreboard/libreboard,wekan/wekan,wekan/wekan,GhassenRjab/wekan,libreboard/libreboard,wekan/wekan,GhassenRjab/wekan