I'm not sure I understand the question. The Catalan translation was released and can be viewed here: http://ai2.appinventor.mit.edu/?locale=ca
We did migrate away from pootle. For a couple of years, we used Google Translator Toolkit until Google started charging for the service. Now we used a self-hosted weblate server (weblate.appinventor.mit.edu). Wherever possible, we migrated existing translation work to the new services. I don't know specifically about Catalan.
If you would like to update the existing translation, please take a look at the pinned post in this topic: About the Translating App Inventor category