I think this may be beyond the scope of TubeBuddy, but as an idea on itΓÇÖs on, I like it.
I actually donΓÇÖt understand why google wouldnΓÇÖt automatically translate all English into the viewerΓÇÖs native language. I sometimes will find my way to Japanese sites thanks to Pokemon Go and the browser will automatically translate it into English.
Translating your title and description manually however, will mean youΓÇÖre isolating all other languages of other visitors to your play list.
Until translation is automated via the web browser on the user end, I donΓÇÖt see this becoming a thing.