Installing interface language

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Hi everyone
I am accidentially running c5 in English (should be German for my customer). Where can I change the interface language (for dashboard and blocks )? When I go to dashboard- system & settings - basics - languages - I get the message:

You don't have any interface languages installed. You must run concrete5 in English.

Tx for your help

pixeljunkie
 
pixeljunkie replied on at Permalink Reply
pixeljunkie
Sorry, I am a bonehead. I accidentially deleted the language file in application.