Author: Amaia Anabitarte
MDL-76997 admin: Option to reset course indentation
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1c491de8e8e690a099c0cc9e9ee0bc0b7ae7f973
http://github.com/moodle/moodle/commit/1c491de8e8e690a099c0cc9e9ee0bc0b7ae7f973
+ 4.2 en [resetindentation_title,core_admin]
+ 4.2 en [resetindentation_help,core_admin]
+ 4.2 en [resetindentation,core_admin]
+ 4.2 en [resetindentationsuccess,core_admin]