Author: Aparup Banerjee
MDL-29527 RSS : improved language string.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ef0aa7ba5c11991491a1191580fa6665c6763073
http://github.com/moodle/moodle/commit/ef0aa7ba5c11991491a1191580fa6665c6763073
+ 2.2 en [rsskeyshelp,core]