Installing Linux in Languages Other than English?

m0nkyman asks: "My company has just hired a Mexican and his whole family has moved up here to Canada to join him. As the in-house tech geek I'm planning to put together a computer as a gift to the family for school etc. Although they are learning English, I know they'll be happier in a Spanish environment. My question is which Linux distribution has the best Spanish language support, and are there any hints for how to install it for an English only geek? This isn't something I've run into before, but I'm sure others have... right? I've looked at here for help, but I'd like other recommendations."