Author: Paul Holden
MDL-78554 tiny_link: define help link text language string.
Backport of MDL-77874
http://git.moodle.org/gw?p=moodle.git;a=commit;h=32f9d1eeb541a8540d5f95e20dd86d7428aa9c83
http://github.com/moodle/moodle/commit/32f9d1eeb541a8540d5f95e20dd86d7428aa9c83
+ 4.1 en [helplinktext,tiny_link]