Add missing parameter to test

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/tests/test_models.py

@@ -330,6 +330,7 @@ class RepoTestCase(TestCase):
             repo='weblate://test/test',
             file_format='po',
             filemask='po/*.po',
+            new_lang='contact',
         )