From the AppSource we can download some extra languages.

Most users who use this language are from Spain and they use the spanish without problems.
But for the other hand this is the official language in Andorra, so we think that it should be included as standard.
Needs Votes
Ideas Administrator

Thank you for your feedback. Currently this is not in our roadmap; however, we are tracking it and if we get more feedback and votes, we may consider it in the future.

Aleksandar Totovic
PM, Microsoft