Should help keeping the database/backups a bit smaller.

Closes #2959

* Broadcast Central

* Change name to Stream_Cast

Additionally:
- Remove wrong translation for custom fields
- Move save custom field code to function

* Remove uncessary log

* Refactor login/registration code

* New setting to add custom translations

* Add option to not require password confirmation on signup

* Add Custom Fields for registration

* Closes #4036; Do nore remove roles when editing user data

* Add arrow to indicate fields of type select