These guys at the CDLR don't consider a priority to add Aragonese and Occitan to Spain. I asked them almost a year ago and they left the request on queue. I don't know why they can't process requests efficiently.
Topic on Talk:Universal Language Selector/FAQ
Or maybe they did even reject it for lack of priority, I can't remember. Anyways, it sucks.
I came here from Wikidata as it would have been interesting to have Occitan as a default language, considering it is a fallback language for Wikimedia projects in Catalan. But I don't know if this is the place for this comment to be taken into account.