Author: Frederic Massart
MDL-40055 mod_assign: Replace add_to_log 'submit'
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6332ff7a35658c975fe7e590eb563253954f7b08
http://github.com/moodle/moodle/commit/6332ff7a35658c975fe7e590eb563253954f7b08
+ 2.6 en [event_submission_updated,mod_assign]