I should do Linux ports of the other games as well, but they all use different versions of the engine and I don't have a Linux installation to test if everything works fine.
The good thing about games made with AGS (the engine I used) is that they can be run through ScummVM (https://www.scummvm.org/), a program available for Linux that supports the engine -- plus a huge amount of other games. So, if you have trouble running them through Wine, you could try ScummVM (it's free!).
Regarding a German translation, it's the first time I got asked for one! If I get more interest in it, I could see if something can be done about it.