Hello,
I finally found time to finish it.
Thanks again to all and Kawa for the tool. I finally found out how to write umlauts.
1. I renamed the vocab.000 to vocab.910
2. In tool "SCICompanion" Menu --> Game/Version detector/Parser vocab 900 on (then reload the game)
I can now use umlauts, but i have to write it like this:
ä „
ö ”
ü
ß á
(ü you can't see, but it's still there)
3. Export it as patch file and renamed it again to vocab.000
(But it works only with ScummVM

)
german files under:
http://shaklin.com (under translations / laura bow 1)