Subtitles aren't free either. They still have to pay someone to do the translation. And find someone willing to do it. And then code it into the game.
Hopefully more translations will come in the future but it's not as easy as some people seem to think it is.
I myself am a volunteer translator for Valve software. And we don't get paid, so Valve gets their translations for free.
So yeah... free.
Not to name countless games which have fan translations.
Also, a little off topic, why the hell do I need to have 450MB of german sound files?
EDIT: BTW, "code it into the game"? If they have done their homework (which at this point, after seen all the lag, unwanted language files, etc I start to doubt) It would be a 2 minute work.
I currently do web development and I have done app development for years and adding a new language to my webs or programs is as easy as adding the language file, no codding needed. But yeah, this is RTG, they may need to start the game from scrath
BTW, here's a good read: http://en.wikipedia...._of_video_games