Part of me really wants that, but as a sort of "I'm done with the game, but still wanna add stuff" update. Plus you can already technically translate some of it. You learn some of the basic structure and I really enjoy learning it that way. It's how I learned a little Chamorro, by speaking to a friend, and that's how the convo with Teely felt.
That's pretty much where I am with it. And there are definitely other things I want to add for post-game content once the story is done, and I'm sure there'll be bugs to fix that will require a couple extra updates anyway.
It's also meant to be fairly easy to learn once you start picking up on it in that it's syllabic (meaning complex ideas are represented by a combination of words for simple ideas rather than having their own word).
Like that conversation with Teely kinda goes over, "auga" always refers to water. Even if "auga" and "Auga" technically have a different meaning, it still refers to water in some capacity. The same applies to every other syllable, so once you start figuring things out, it shouldn't be too difficult to get at least pretty close to what they're trying to say.
And even if you don't want to bother trying, almost nothing is said in Uncommon that's truly important. The few things that are usually get repeated anyway.