Author: Frederic Massart
MDL-40055 mod_assign: Replace add_to_log 'lock submission'
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3d1331be34ee4a039d6525c0ae95fbbb1060f858
http://github.com/moodle/moodle/commit/3d1331be34ee4a039d6525c0ae95fbbb1060f858
+ 2.6 en [event_submission_locked,mod_assign]