Author: Juan Leyva
MDL-26976 files: Display space usage message in private files
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b5ef326c03a3252f4b47184042e4acdf947ebd0f
http://github.com/moodle/moodle/commit/b5ef326c03a3252f4b47184042e4acdf947ebd0f
+ 3.4 en [quotausage,core]