Hi everybody...
I'm a french guy and I wanna ask something : when will you put french patches on GOG ? With subtitles for example
I think someone told me that it would be done, but he didn't tell me when...
Someone can answer me ?
Thank you very much. And sorry for my poor english !
GOG rocks !!

For now, I believe GOG is only focusing on English languages, unless the game itself is already catered to different languages.
Whether GOG decides to add different language support, not sure, maybe. Only they can say.

GoG was ... pretty vague when this topic was discussed last time I remember, which probably means they'd like to, but lack the resources necessary to do something like that for every game. You have to understand, for most translations, there are even more copyright issues to be solved

A few GOG releases include French already; they will install in English by default but you can then change to another language by editing a configuration file or two. The included languages aren't listed on the store pages yet, unfortunately, so you will need to ask on the forums of the games you are interested in.

This thread may be of some help. Not every game supports other languages, but for those that do, you can find out how to activate them here.