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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.