Since so many apps use software from the world over, I don't think it's unusual to find other languages in apps today but you need to ask the German company what's up.
With anydesk, I did a copy and paste and got the following: സ皳呓䵒 If I use Google Translate, It spells Moth. Is anydesk compromised by the Chinese or is the German company just a front for the Chinese? Why would ANY chinese symbols be displayed in a German Program that has an english version???

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