Author: Ryan Wyllie
MDL-59936 calendar: use icons in event summary modal
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4febb36efeb61df1ae7861acd3b31bbbbe2d3530
http://github.com/moodle/moodle/commit/4febb36efeb61df1ae7861acd3b31bbbbe2d3530
+ 3.4 en [eventsource,core_calendar]