One day the launcher updated, and Catalan haven't showed up since that day. I don't know if it's intended or not.
MCL-12743
Catalan doesn't appear any more
Resolved
Invalid
0
The Catalan translation is not completely finished yet. If you want to help out, you can help with the translation on the Minecraft Launcher Crowdin project. Catalan is currently 100% translated and 51% approved.