Author: Huong Nguyen
MDL-64032 enrol_manual: Make consistent the UI for setting enrolment
Add end date/duration for the UI for setting enrolment should be consistent
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0fc30827dce3d6373959b7fc28ce27d1e5dbf825
http://github.com/moodle/moodle/commit/0fc30827dce3d6373959b7fc28ce27d1e5dbf825
+ 3.8 en [invalidenrolduration,core_enrol]