is with this Patch the Game in other languages? in german?

Hi,
Yes, the game is auto-translated to German. While the translation isn't perfect, it is generally of high quality, making the game completely playable. Additionally, we have ModIO support, and there is a German language pack maintained by some dedicated fans, which you might find improves the experience even further.

Good to hear,

where can I Download the german language pack? For GOG?

There is modIO support in the game (options, language settings)