Hi Ludwig,
ccs is based on eclipse (v3.8). What you will need for german language support is some type of plug in of your choice. For example a google search will lead you easily to the babel project plug ins, however there are also some plug ins that can be used with dyoxygen for example.
CCS itself is essentially an eclipse plug in.
HOpe this helps and all the best.
Best REgards,
LIsa