Even so once you register on Steam you seem to get all the languages any way. I don't recall if the retail version was limited in languages (I don't think it was) but it certainly isn't on Steam with a previously UK retail copy. Unfortunately my old game disc is buried in a cupboard, so I am not willing to double check.
Realistically I don't see much use from a modding perspective to get access to the locale file, while sure it could be used to add more drivers, it's really the only useful aspect.