There are caveats beyond the gray area of emulators themselves. You'll need to walk through a setup process to make AI translation work. Also, the translations will only be as good as Google and other services can provide. That's not necessarily a deal breaker given the rough state of some official translations (just look at the unintentionally hilarious Zero Wing for an example), but it's something to consider if you're less than familiar with a given title's plot. Even so, this could be very helpful -- and might show developers how to bring classic games to wider audiences.