Author: Sara Arjona
MDL-68567 badges: add/remove site backpacks
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a80541ea903fb1d51759cbd37448a9a2e6568092
http://github.com/moodle/moodle/commit/a80541ea903fb1d51759cbd37448a9a2e6568092
+ 3.9 en [delexternalbackpack,core_badges]
+ 3.9 en [newbackpack,core_badges]
+ 3.9 en [sitebackpackdeleted,core_badges]
+ 3.9 en [sitebackpacknotdeleted,core_badges]