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=14e14676f2d303ab9fd6c45bb6a598cf30263e63
http://github.com/moodle/moodle/commit/14e14676f2d303ab9fd6c45bb6a598cf30263e63
+ 2.0 en [displayselect_help,mod_resource]