This thread is resolved. Here is a description of the problem and solution.
CF7 confirmation message in the default language is in English.
You need to do is edit the original form that you have created and go to the Messages tab and replace the English messages with German messages. The following link to CF7 documentation might also be helpful to you.
If you want to know how to translate CF7 forms properly, please check the following link to our documentation about how to work with WPML and the CF7 plugin.
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