Meta announced a new AI model called Voicebox yesterday, one it says is the most versatile yet for speech generation, but it’s not releasing it yet: The model is still only a research project, but Meta says can generate speech in six languages from samples as short as two seconds and could be used for “natural, authentic” translation in the future, among other things.
Not really AI but if you want to learn lojban you get most of the way: The language actually has a formal grammar so it’s possible to write bog-standard software that doesn’t care when you say “You must have patience, my young Padawan” instead of “Patience you must have, my young Padawan”. It’s going to tell you which it expected but not beat you over the head with it.