Yeah, this is one of those things which sounds great on paper but also introduces problems. I've seen people get really annoyed when exception messages are translated because it makes them harder to search for online. That would need to be solved too.

I've had huge issues collaborating on a spreadsheet with a Spanish client. It tries to open the sheet in your locale and then can't find the functions. Insane that Microsoft didn't even add some metadata to allow me to work on it in Spanish.