what I found out up till now:
textstrings seems to be translated automatically. If you go to languages > translations (second menu item) > remove all layerslider translation strings (show layerslider group)
after that: cleanup database with unused text strings (at the bottom of the list)
thanks Seth, will try that!
Simply brilliant! That fixed the issue.
Although strange that it produces the error only recently..
Anyway, thanks a lot.
