This message appeared suddenly. I upgraded OpenGoo to 1.4 last week. Everything worked fine. This morning I got this message in all tabs - just out of the blue.
I am using Englsih as default by the way.
On the forum I have seen this error but the answers are not relevant in this situation. Neither the suggestion to copy the language file to /assests/javascript because that creates a 500 error.
Hope this can be fixed! Thanks!
Paul