Author: Shamim Rezaie
MDL-46317 admin: Added admin\local\settings\filesize class
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e2d97a4659740b4f60462529084ff812ae67da2a
http://github.com/moodle/moodle/commit/e2d97a4659740b4f60462529084ff812ae67da2a
+ 3.8 en [filesizeunits,core_admin]