other logo than erp5 (like safi logo)
* remove uses of % in the search of the best help webpage : get the
corresponding page or get nothing (get a help page of another portal type is
useless)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@23680 20353a03-c40f-0410-a6d1-a30d3c3de9de