Author: Helen Foster
MDL-22624 help string thanks to Davo Smith for suggested wording
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8a18d8b80633769718b23f9e19531d27fe052c0b
http://github.com/moodle/moodle/commit/8a18d8b80633769718b23f9e19531d27fe052c0b
+ 2.0 en [configrolesinparams,mod_url]
+ 2.0 en [displayselect_help,mod_url]