Add Norwegian Bokmål to the list of languages in the fantasycore mod too

Slightly longer explanation:
A while back I translated parts of the engine, adding a new .po file and adding nb to the list of languages. But when the latest engine changes were synced to the game recently, I couldn't find Norwegian Bokmål in the list of languages.

However, I realized that if I disabled the fantasycore mod, it would appear in the list. The reason seem to be fantasycore's languages.txt which overrides default's. From what I can see, both lists need to be updated for a new language to always be available in the menu. Is this intentional, for instance to allow adding new languages to a game without having to include it in the engine first, or a bug?