Author: Jean-Michel Vedrine
MDL-49642 mod_lesson: Fix issues found during integration review
http://git.moodle.org/gw?p=moodle.git;a=commit;h=247980b0e8c1b090c1708f92b192eb55429731ab
http://github.com/moodle/moodle/commit/247980b0e8c1b090c1708f92b192eb55429731ab
+ 2.9 en [inactiveoverridehelp,mod_lesson]