Author: Matteo Scaramuccia
MDL-29708 Fixed extra slashes in $string['storedfilenotcreated'].
http://git.moodle.org/gw?p=moodle.git;a=commit;h=874db754cebd7220df9c662ccb10b43e3ae6bb01
http://github.com/moodle/moodle/commit/874db754cebd7220df9c662ccb10b43e3ae6bb01
+ 2.6 en [storedfilenotcreated,core_error]