Author: Matteo Scaramuccia
MDL-29708 Fixed extra slashes in $string['storedfilenotcreated'].
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ad3ade768153a655bde7843fed3d649eb41a0377
http://github.com/moodle/moodle/commit/ad3ade768153a655bde7843fed3d649eb41a0377
+ 2.8 en [storedfilenotcreated,core_error]