Author: Amaia Anabitarte
MDL-67800 core_contentbank: Creating events for contentbank
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fb302d3848c499e85a9c12a6a16f5c5cfb8310d9
http://github.com/moodle/moodle/commit/fb302d3848c499e85a9c12a6a16f5c5cfb8310d9
+ 3.9 en [eventcontentcreated,core_contentbank]
+ 3.9 en [eventcontentdeleted,core_contentbank]
+ 3.9 en [eventcontentupdated,core_contentbank]
+ 3.9 en [eventcontentuploaded,core_contentbank]
+ 3.9 en [eventcontentviewed,core_contentbank]