Author: Matteo Scaramuccia
MDL-29708 Fixed extra slashes in $string['storedfilenotcreated'].
http://git.moodle.org/gw?p=moodle.git;a=commit;h=99261fdf0572972acb18e85e9c3e507f76c65a82
http://github.com/moodle/moodle/commit/99261fdf0572972acb18e85e9c3e507f76c65a82
+ 2.7 en [storedfilenotcreated,core_error]