Advanced layout builder in other language since adding WPML

I translated the website from German to English some time ago by using WPML.
Now I have this nice language switcher in the backend, which works more or less, BUT:

Now even if I am writing a german article, the Advanced Layout Builder is completely in English.
When I add a content element to my German article, Advanced layout builder is inserting it in English. For example if I drop a comment section into my article, it’s content is in English. The user see’s “Leave a Reply Want to join the discussion? Feel free to contribute!”, although the article is setup as German.

This was different before I added the second language. Can anybody give me a hint? This must be a setting somewhere.