Author: Ankit Agarwal
MDL-36621 calendar: Display subscription info in calendar event popups
http://git.moodle.org/gw?p=moodle.git;a=commit;h=07c03ff96a3de1b4d296e36b93f0d98c31d3a8d7
http://github.com/moodle/moodle/commit/07c03ff96a3de1b4d296e36b93f0d98c31d3a8d7
+ 2.5 en [namewithsource,core_calendar]