This is situated in your Header builder – https://take.ms/bn0CS, by default we don’t have it so most likely someone added it to your header. Just remove that HTML Block in your header builder to fix that issue.
There are still these errors in my webpage code. What is this error and is it caused by a translation plugin (which has been removed)? How can I remove these errors?
Please, confirm the permission for plugins deactivation, and switching to the parent/default theme. As soon as we complete the testing we will enable it all back.