Hello,
Thanks for reporting this issue.
It has been fixed for version 2.7 final.
We appreciate very much that you want to upgrade the German language pack, we can give you access to our official translation tool so all the changes you make there will be included in the next release.
If you are interested in using this tool please write to us at support@fengoffice.com and we'll give you the access and the instructions.
Best regards