Author: Rex Lorenzo
MDL-30790 - Option to collapse or expand sub-folders
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f29572785958265d8be6f83d538e3774bffc44e4
http://github.com/moodle/moodle/commit/f29572785958265d8be6f83d538e3774bffc44e4
+ 2.5 en [show_expanded,mod_folder]
+ 2.5 en [show_expanded_help,mod_folder]