skymandr: My own German is probably no better than yours, but I've contacted some German Adams-fans. Hopefully it will result in a pull-request sooner rather than later!
No worries. I've just gotten an offer for help from one of the users in the ScummVM IRC channel. So that should be taken care of shortly. Though it's definite now that the initial testing period will only be for the English version. Whilst I've taken care of some new code added in the German version, such as the translation tab in the PET, and some extra code in the parser, there are still two areas remaining. Firstly, and somewhat bizarrely, it looks like they changed over lots of the WAV filenames used for sounds in the game. Which means that for every single sound in the game, I'd need to figure out where the method calling it is in the German version and find out what filename it uses. Lot of drudgery. :P. The second is somewhat more understandable.. the NPC scripts have some variation in logic for handling the different language semantics for German.
I'll quite possibly spend some time during the testing period implementing some of these further changes for German, I'm not going to commit to having it supported in the near term. It may be left to someone else, particularly the tracking down of all the sound calls.
Speaking of testing period, whilst I had hoped to announce testing at the start of the week, my second playthrough identified several further errors that I'd like to fix first. One in particular touches on the decoding of the transparency (alpha) layer for some videos, and how it's used to draw the video frames. This could potentially affect multiple videos throughout the game, so I figured it will be best to have it sorted out before I make the announcement.
At most, this will just be a delay of a few days, and an announcement for testing will still go ahead this weekend.