Author: Bas Brands
MDL-71610 theme_boost: add a edit mode switch
http://git.moodle.org/gw?p=moodle.git;a=commit;h=09f6ce9fed752e47fc719228032aab075c526c09
http://github.com/moodle/moodle/commit/09f6ce9fed752e47fc719228032aab075c526c09
+ 4.0 en [cannotswitcheditmodeon,core_error]
+ 4.0 en [editmode,core]
+ 4.0 en [setmode,core]