Author: Brendan Heywood
MDL-69718 core: Added support for TB and PT to display_size
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6e935cc29cb1aba7c004158979c3304ea32119c8
http://github.com/moodle/moodle/commit/6e935cc29cb1aba7c004158979c3304ea32119c8
+ 4.0 en [sizepb,core]
+ 4.0 en [sizetb,core]