users: tests: functional: Leave no-language as final setting

- Whenever functional tests for user app are run, the tester user is left with
the last language that is tested. This is a minor inconvenience. Fix this by
adding no-language option to test at the end.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/users/tests/test_functional.py

@@ -10,6 +10,7 @@ from plinth.tests import functional
 scenarios('users.feature')
 
 _language_codes = {
+    'None': '',
     'Deutsch': 'de',
     'Nederlands': 'nl',
     'Português': 'pt',
@@ -26,6 +27,7 @@ _language_codes = {
 }
 
 _config_page_title_language_map = {
+    '': 'General Configuration',
     'da': 'Generel Konfiguration',
     'de': 'Allgemeine Konfiguration',
     'es': 'Configuración general',

plinth/modules/users/tests/users.feature

@@ -51,3 +51,4 @@ Scenario Outline: Change language
   | తెలుగు          |
   | Türkçe         |
   | 简体中文       |
+  | None           |