The settings tab of each category channel should now present the option to allow or disallow channel wide mentions: @here and @all.
When disallowed, using these mentions in the channel should have no effect.
7e39a21de1
broke the explanation of the check box on `create-channel` view.
Actions:
- uses core yes_value/no_value
- re-add the correct translation for `enable_auto_join_users`
- removes `disable_auto_join_users` which is not used anymore
