Hi Stefan and List,
I have created the FingerSpeller config file for German Sign
Language.
The whole alphabet should be supported. I was able to get accented
characters and combinations to work.
abcdefghijklmnopqrstuvwxyzÄÖÜssßsch
The horizontal output looks good. Vertical is also available.

German Sign Language FingerSpeller is ready to use.
http://www.signbank.org/signpuddle2.0/fingerspeller.php?ui=8&sgn=53
Please let me know what you think. For the ASL, we are considering
pulling the arrows in tighter to their base.
I can recenter or adjust any letters if you need.
Regards,
∼Steve