on the talk page and a regular call to editors to clean up the user's bad English in his contributions be enough? If it's cleaned up, no one can complain about it. It is hard to ring-fence the 'problem'. New articles like [[Yen block]] and [[yuan of Manchuria]] are being spun out all the time. I can quite see why these cause puzzlement. If you don't know the dialect ('poses' = 'possess' = 'have') it looks weird. But if people used CleanUp as intended it would be better.