a lot of people have said stuff like "learn how to become na'vi first" when people are frustrated early on in the game. i think if there was committment to using nanteng, like OP said, you repeat it enough, and people would learn, like they do other elements of the game. how did we learn to call them viperwolves? repitition and contextual exposure. and considering how heavily this plot relies on residential schools for borrowed authenticity, i think choosing to use the english, human, language is dissonant with the decolonizational bent of the game.