Author: Jean-Michel Vedrine
MDL-43387 mod_lesson: add an editor for essay grading comments
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ebf5ad4fa291e7312470e7686212818dbf96e4d2
http://github.com/moodle/moodle/commit/ebf5ad4fa291e7312470e7686212818dbf96e4d2
+ 2.9 en [essayresponses,mod_lesson]