This is ironic in that the hardest titles to find supported language info for are the first party titles as in you can't just do it on the NCL website (because first party titles have minisites rather than summary pages). The eShop listing should furnish info but that requires being able to read the page rather than have google translate do it for you.
Really? That is not what NCL says:
https://ec.nintendo.com/JP/ja/titles/70010000000035
I guess that could be another thing to considering is the listing info being wrong
Hopefully it isn't wrong in saying it supports languages it does not.