Pheace: I'm confused why either of you are crediting or discrediting Steam in that regard. Atari will be the one supplying the game, and from the looks of it, they're happy distributing the Gog-ish version.
Of course you're right. I just meant that I had the (uninformed) idea that Steam would be a more international distributor, trying to get non-English speakers to use their service, too. In the end, it might be more of a publisher thing, but didn't you say yourself that the publishers have a great interest in getting their games on Steam, too? Steam is a successful business, surely Valve would not be forced to accept their offer if it would go against their principles? So I gave them credit because I thought multi-language support was part of those principles and their strategy to grow internationally, which Trilarion suggests is not necessarily the case.
Trilarion: Actually there is such a case. DotEmu sells a game that is also on here and either the are displaying the supported languages much more careful than here or they actually support more languages, although the initial publisher should be the same.
Actually DotEmu's unique selling point compared to GOG is this multi-language support on most (curiously not all) titles. If GOG took the same care to provide multi-language support, there would be no reason to buy from DotEmu (they don't have a lot of different games to offer and the prices are often higher, at least for Europeans).
But it's probably not as easy as the original publisher owning all teh licenses. I'd guess that to include the localizations one would have to talk to the local publishers/distributors, too. (And this seems to be what DotEmu is more interested or better in than GOG; maybe it's reflected in the higher prices, too)