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I don't think it would be possible without default replacing one of the languages which is already installed. You'd have to edit the game's core code otherwise, I assume, in order to tell it that there's an additional language in the list to select from. But you could default replace one you'd never use. Since you can't have two languages in play at once anyway, that would be a workable solution, even for people who speak the language that you decided to replace. However, as Voeille says, it would be a hell of a lot of work. Remember localisation in game companies is usually handled by an entire department, and most of that is translation (it's called loca, rather than translation, because there's much more to it than that - you can't just blindly translate all the text because you have to be aware of cultural phenomena etc which may be untranslateable or for which a direct translation won't work.)
I use the sims as a psychology simulator...