It already exists in the form of live page translation. You can get Google Translate to translate pages for you as you browse them. And then if you want to write a reply, just translate it in Google Translate (the actual website).
The problem with translation software however is that it doesn’t understand context, I.e. it’s crappy for really specific translations. You might wanna tell someone their idea is amazing and they must definitely ask IA to implement it, but it might as well turn into something like “Your idea is confusing and you must force AI to include it”. Not to mention… whatever the hell that phenomenon is. Google “Random Typek” and “Google Translate Sings (by Malinda Reese)” and see for yourselves.