Hello, I would like to contact any GOG employee to know if they add versions with foreign languages ( text and/or audio).

I want know if they accept copies of games in language not avaible now in the store. That's the case of Star Wars Dark Forces Jedi Knight (But don't haver the expansion Mysteries of the Sith) and Incoming, I have both physical copies dubbed in brazilian potuguese but it is'nt avaible on GOG.COM and I think it would be nice to share with the community who bought the game here. I'm not sure about manuals because it is stored and I can't check right now.

Let me know if GOG has interest in these versions.

Thanks in advance

I'd suggest contacting a GOG staffer via PM or open a support ticket.

That depends on the game and translation. On some cases the current publisher has all the rights to all the versions available and that globally. In those cases GOG can offer all the version they can get their hands on.
In other cases the rights of the translation for a specific language are still with a translation/dubbing studio, or they are with a different publisher (some games had/have different publishers in different parts of the world). In this case GOG would have to get a permission from those first - if they still exist. If they don't it gets even more complicated to track down who to ask...

But as Bookwyrm627 wrote - contact support find one of the "blues" to chat with and ask.

As toxicTom very well stated sometimes GOG has permission to include certain translations. Other times not.
Myself I've offered GOG certain versions translated to portuguese. Some of them they were able to upload to the store, while others they could not because of different publisher rights.

As Bookwyrm627 wrote, if you contact one of the "Blues" they'll be able to help in that issue.

I contacted the "Blues", they said same thing about publisher rights. It's a shame the games I own cannot be sold on the store because Brasoft doesn't exists anymore (closed in2004). It means that version of the game will be forever lost, it's a sad truth.

You should keep safely stored somewhere (in physical form or in a cloud). One never knows if an opportunity for them to be sold again may appear :)