As far as I know not yet unless you compile it yourself (someone linked some translation changes earlier in the thread) but I recommend using
http://yokaiwatch.wikia.com/wiki/List_of_Yo-kai_by_Medallium_Number_(Yo-kai_Watch_2) to find yokai numbers if adding Yokai
and...
Just wondering, is there any way to make yokai appear in the medallium? I added the dlc yokai & pandanoko and they work but don't appear in the medallium. Not a big deal just wanna know whether it's possible to treat them as if I befriended them in game/obtained them legitimately.