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I can confirm that. If the site is not in german, many will not use it because they like to understand everything 100%. If the translation has mistakes however it will be the biggest red flag you could give a german person. So if you can't get it 100% correct, you should defiantly not do it at all 
Thanks for the feedback
Are there many mixer users among germans?
Unfortunately, I don't have any numbers or statistics on this, but I have friends who regularly use a mixer. Since bitcoin is now also very well known in germany, many people also realize that it is not 100% anonymous and therefore use mixer to protect their privacy. Are there many mixer users among germans?