Here’s some entirely noncanonical thoughts about xenolinguistics and how things could play out on Earth C if any of this actually mattered.
Skaia was working as a universal translator for all players
of the game. The humans, trolls, and even carapacians were all speaking and
writing in different languages, but Skaia would translate for them for the game
to not immediately crumble. As a part of the General Time Fuckery, Skaia’s translations have been in effect for everyone’s lives since the day the babies first crash landed on Earth.
Then, they win the game. And Skaia isn’t helping them any more.
This becomes a problem on Earth C within days. The longer everyone is separated from Skaia the less and less they can understand each other. It doesn’t take long until the language barrier becomes Earth C’s first significant dilemma.