User configurable locale (language) (#10204)

* Support for system APP_LOCALE

* Start preferences re-write

* port 2fa form

* Working user preferences

* Language user preference

* Don't look up locale from the DB every request

* Device list working

* Deny demo user middleware

* Finish password changing

* remove used resource methods

* remove leftover use

* warn that translation is incomplete

* fix style

app/Http/Requests/UpdateUserRequest.php

@@ -43,6 +43,7 @@ class UpdateUserRequest extends FormRequest
             'level' => 'int',
             'old_password' => 'nullable|string',
             'new_password' => 'nullable|confirmed|min:' . Config::get('password.min_length', 8),
+            'new_password_confirmation' => 'nullable|same:new_password',
             'dashboard' => 'int',
         ];
     }