We're not testing the redirects anymore. But the error messages should be pretty clear already. We can start testing redirects again once we redirect to different places for different actions.

There's an identities tab now for admins that will allow unblocking blocked handles. It should be easy to expand for aliases and forwards and other types of actions such as editing.

Feature/i18n for ticket system

Identity.new.valid? should not crash. So validate presence where needed and
skip the other validations if the value is absent.

We create an identity alongside each user. Make sure the identity
is valid when creating the user. This also ensures that the login
picked is available because otherwise the identities address would
not be available anymore.