Author: Sam Hemelryk
MDL-27405 navigation: My courses branch now shows categories if navshowcategories is enabled
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b0712163e6eee4f8f704a625e95d5d59309d7694
http://github.com/moodle/moodle/commit/b0712163e6eee4f8f704a625e95d5d59309d7694
+ 2.3 en [navshowmycoursecategories,core_admin]
+ 2.3 en [navshowmycoursecategories_help,core_admin]