I do not recognize some of your mods. I assume you've gotten them from other sites. From what I could find on one of them (might not be the same mod), it is for old versions of SH4. Just be sure that what you're loading is in fact, compatible with OM. Lurker was rather adamant about what he considered "compatible", so if something doesn't specifically state it is compatible, de-activate it, and see what you get. The specific ones I can't find are:
1. Befehle (stock game language fix? If so, it's pre-v1.5)
2. TorpedoFix (there are a several of these - which one and why?)
3. WaBoWarnung (?? "WaBoWarning"...)
4. BoldFix (the name is familiar, but I cannot fully remember it)
As for the crew fully speaking the German language (other than "Passing thermal layer"), Brigodoon tried this one
German Speech Fix in the thread:
http://www.subsim.com/radioroom/show...96#post2534896