Author: Sara Arjona
MDL-69269 contentbank: add support to download content
http://git.moodle.org/gw?p=moodle.git;a=commit;h=66455e02d8e293572d4ad523fdea0ed287c4cce3
http://github.com/moodle/moodle/commit/66455e02d8e293572d4ad523fdea0ed287c4cce3
+ 4.0 en [contentbank:downloadcontent,core_role]