remove all_languages default arguments. Here it's useless, we can use **kw to pass it. And default value is the same in called script (False).
This also permit to fix this understandable comment.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26662 20353a03-c40f-0410-a6d1-a30d3c3de9de