Author: Dongsheng Cai
MDL-71239 calendar: disallow manager role users edit user events
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1b2ec27efc8dabc5709fde493042a8784b48673d
http://github.com/moodle/moodle/commit/1b2ec27efc8dabc5709fde493042a8784b48673d
+ 3.10 en [nopermissiontoviewcalendar,core_error]