feat: add PreserveUserLanguageCookieMiddleware

This ensure to use the cookie language if the user send it.

eox_nelp/middleware.py

@@ -5,6 +5,9 @@
 classes:
     ExtendedProfileFieldsMiddleware: Set extended_profile_fields in registration form.
 """
+from django.conf import settings
+from django.http import parse_cookie
+from django.utils.deprecation import MiddlewareMixin
 from django.utils.translation import gettext_lazy as _
 
 from eox_nelp.edxapp_wrapper.site_configuration import configuration_helpers
@@ -133,3 +136,21 @@ def handler(form_instance, form_desc, required=True):
             # pylint: disable=protected-access
             form_instance._add_field_with_configurable_select_options(field, label, form_desc, required=required)
         return handler
+
+
+class PreserveUserLanguageCookieMiddleware(MiddlewareMixin):
+    """This middleware ensure that in the COOKIES property the LANGUAGE_COOKIE_NAME
+    key has to be the cookie sent by the user and not other,
+    because it could be modified previously by other.
+    eg.
+    https://github.com/openedx/edx-platform/blob/open-release/palm.master/openedx/
+    core/djangoapps/lang_pref/middleware.py#L61-L62
+    """
+    def process_request(self, request):
+        """Process the request to change the language cookie based in original cookie value."""
+        original_user_language_cookie = parse_cookie(request.META.get("HTTP_COOKIE", "")).get(
+            settings.LANGUAGE_COOKIE_NAME
+        )
+
+        if original_user_language_cookie:
+            request.COOKIES[settings.LANGUAGE_COOKIE_NAME] = original_user_language_cookie