Author: Andrew Nicols
MDL-47944 mod_forum: Improve discussion subscription icon/link
* make the link text clickable
* changes the link text when unsubscribed to the action text "Subscribe"
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a35ce611cf7d5679f27ae37be4b7bc595dc3f718
http://github.com/moodle/moodle/commit/a35ce611cf7d5679f27ae37be4b7bc595dc3f718
+ 2.8 en [notsubscribed,mod_forum]