So, today (tonight?) I'm looking for some fics in which Tony speaks in a different language. We know he is a genius, so he wouldn't have that hard of a time picking up a new language. Also, he most likely has customers and such in other countries. And, I think living in a cave for 3 months with people speaking other languages would cause him to learn something, maybe Yinsen even taught him something.
Anyway, thanks anyone who manages to find something! :)