How to Integrate Language Into Your Game

In World of Warcraft, you have procedurally generated gibberish that only serves to prevent factions from talking to each other. Another way you could sort of integrate language in there is with code switching. One of my favorite scenes in Game of Thrones was this scene where you have Ser Joris and Raharo talking and they are code switching the whole time. That's going to be really hard to pull off in written fiction, I think.