CentOS - Jul 2011 - gscan2pdf, tesseract and german language

Hi Folks,

I've installed gscan2pdf, tesseract, tesseract-de (for german language).
But gscan2pdf offers only english as language for OCR (with tesseract selected 
for OCR-Engine).
Where are  "points " (config-files or so) to select german as
language.

Thx
Timothy