perf: Language settings in personal settings

apps/authentication/api/connection_token.py

@@ -375,6 +375,7 @@ class ConnectionTokenViewSet(AuthFaceMixin, ExtraActionApiMixin, RootOrgViewMixi
         for name in default_name_opts.keys():
             value = preferences.get(name, default_name_opts[name])
             connect_options[name] = value
+        connect_options['lang'] = getattr(user, 'lang', settings.LANGUAGE_CODE)
         data['connect_options'] = connect_options
 
     @staticmethod

apps/authentication/serializers/connection_token.py

@@ -75,6 +75,7 @@ class SuperConnectionTokenSerializer(ConnectionTokenSerializer):
     def get_user(self, attrs):
         return attrs.get('user')
 
+
 class AdminConnectionTokenSerializer(ConnectionTokenSerializer):
     class Meta(ConnectionTokenSerializer.Meta):
         model = AdminConnectionToken

apps/authentication/signal_handlers.py

@@ -37,7 +37,7 @@ def on_user_auth_login_success(sender, user, request, **kwargs):
         cache.set(lock_key, request.session.session_key, None)
 
     lang = request.COOKIES.get('django_language')
-    if lang:
+    if not user.lang and lang:
         user.lang = lang