Author: Zig Tan
MDL-42818 assign: Add grading UI indicator about followup submission
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fcb7d2a976b7425eea72f7236a67ec9c49314d8c
http://github.com/moodle/moodle/commit/fcb7d2a976b7425eea72f7236a67ec9c49314d8c
+ 3.6 en [gradedfollowupsubmit,mod_assign]