port-fix: get_object call was missing request argument (#7318)

CHANGELOG.txt

@@ -9,6 +9,7 @@
 * Backported from develop: Added support for Github Actions based CI.
 * Backported from develop: Added Support for testing frontend, docs, test and linting in different/parallel CI pipelines.
 * Backported from develop: Remove travis integration from the project as the project has moved to Github Actions.
+* Backported from develop-4: Fixed usage of ``get_object`` in ``edit_title_fields`` of the page admin.
 
 
 === 3.6.0 (unreleased) ===

cms/admin/pageadmin.py

@@ -705,16 +705,16 @@ def copy_page(self, request, page_id):
         page_languages = page.get_languages()
         site_languages = get_language_list(site_id=site.pk)
 
-        if not any(lang in  page_languages for lang in site_languages):
+        if not any(lang in page_languages for lang in site_languages):
             message = force_str(_("Error! The page you're pasting is not "
-                                   "translated in any of the languages configured by the target site."))
+                                  "translated in any of the languages configured by the target site."))
             return jsonify_request(HttpResponseBadRequest(message))
 
         new_page = form.copy_page()
         return HttpResponse(json.dumps({"id": new_page.pk}), content_type='application/json')
 
     def edit_title_fields(self, request, page_id, language):
-        page = self.get_object(page_id)
+        page = self.get_object(request, object_id=page_id)
         translation = page.get_title_obj(language, fallback=False)
 
         if not self.has_change_permission(request, obj=page):