Copying Content Elements does not copy Language Overlays
Copying content elements in the BE does not copy any associated language overlays. Thus the copy of e.g. a text or text-with-image element in the BE of a multilingual website qualifies as a copy only for the default language but not for any additional languages.
This is very disturbing for editors. They just expect a copy to be a copy.
(issue imported from #M8817)