Author: Juan Leyva
MDL-57759 mod_lesson: New settings for allowing offline attempts
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c6f9f061469d4342309dcfb01a5caaaf8e6659fa
http://github.com/moodle/moodle/commit/c6f9f061469d4342309dcfb01a5caaaf8e6659fa
+ 3.3 en [allowofflineattempts,mod_lesson]
+ 3.3 en [allowofflineattempts_help,mod_lesson]