Merge pull request #22505 from overleaf/em-add-on-checkout

Add an "Add-on:" label to the checkout page for Error Assist

GitOrigin-RevId: c25554b73aa030f880b8d10051247a7cfe5ca3e0

services/web/frontend/extracted-translations.json

@@ -77,6 +77,7 @@
   "add_more_users": "",
   "add_more_users_to_my_plan": "",
   "add_new_email": "",
+  "add_on": "",
   "add_ons_are": "",
   "add_or_remove_project_from_tag": "",
   "add_people": "",

services/web/locales/en.json

@@ -89,6 +89,7 @@
   "add_more_users": "Add more users",
   "add_more_users_to_my_plan": "Add more users to my plan",
   "add_new_email": "Add new email",
+  "add_on": "Add-on",
   "add_ons_are": "<strong>Add-ons:</strong> __addOnName__",
   "add_or_remove_project_from_tag": "Add or remove project from tag __tagName__",
   "add_people": "Add people",