[-] BO : bug in BO translations when Windows OS

[-] BO : bug in BO translations when Windows OS

Impossible to translate the strings of the back office in the directory override/controllers/admin/...
under windows environment.

The statement " $parent_class = explode(DIRECTORY_SEPARATOR,..) " returns wrong result under windows environment. because the path name has '/' and '\' chars.

$parent_class contains bad values and the string "override" is not found.
Merge pull request #415 from ccauw/patch-11

[-] BO : Fix bug #PSCFV-8987 in BO translations when Windows OS