✅(backend) fix test access create

Importing the french translation broke a test
because the subject was not in english anymore.
We change the admin user language to english
to keep the subject in english.

Author: AntoLC

src/backend/core/tests/documents/test_api_documents_ask_for_access.py

@@ -48,7 +48,7 @@ def test_api_documents_ask_for_access_create_authenticated():
     An email should be sent to document owners and admins to notify them.
     """
     owner_user = UserFactory(language="en-us")
-    admin_user = UserFactory(language="fr-fr")
+    admin_user = UserFactory(language="en-us")
     document = DocumentFactory(
         users=[
             (owner_user, RoleChoices.OWNER),