How do you handle the issue of languages in your game?
My characters are heading to Japan, to track down an artifact, and gain the blessings of one PC's father. Of course they'll be meeting english-speakers, but I'm planning on causing trouble for them by taking advantage of the language barrier.
I was thinking of letting them take languages as a series of stunts, to allow for varying degrees of comprehension. There's a test, the JLPT, that basically ranks Japanese language comprehension from rank 5 to 1 (lowest to highest), and since my friends already have rough ideas of what each rank entails, the stunt would give them the equivalency of that rank as a diceroll bonus. The stunts can be bought over and over in the same way for further languages.
What do you do to handle foreign languages and language barriers in your game? Thanks!