Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email email@example.com.
you should have a “magento\app\locale\de_DE” folder (or de_AT or de_CH whatever locale you downloaded), do you?
AFAIK the one from MC is not up-to-date in respect to Magento v1.1.x and you should get the “SVN version” available from the maintainer:
It contains the /app/ folder with all descendants so you can simple drop it into your installation.