Fix l10n call...

backend/test/integration/test_auth.py

@@ -91,7 +91,7 @@ def test_fxa_callback(self, with_db, with_client, monkeypatch):
             assert fxa
             assert fxa.type_id == FXA_CLIENT_PATCH.get('external_connection_type_id')
 
-    def test_fxa_callback_with_mismatch_uid(self, with_db, with_client, monkeypatch, make_external_connections, make_basic_subscriber):
+    def test_fxa_callback_with_mismatch_uid(self, with_db, with_client, monkeypatch, make_external_connections, make_basic_subscriber, with_l10n):
         """Test that our fxa callback will throw an invalid-credentials error if the incoming fxa uid doesn't match any existing ones."""
         os.environ['AUTH_SCHEME'] = 'fxa'
 
@@ -120,4 +120,4 @@ def test_fxa_callback_with_mismatch_uid(self, with_db, with_client, monkeypatch,
         # This should error out as a 400
         assert response.status_code == 403, response.text
         # This will just key match due to the lack of context.
-        assert response.json().get('detail') == 'invalid-credentials'
+        assert response.json().get('detail') == l10n('invalid-credentials')