Author: Mark Nelson
MDL-59612 core: added previous and next links to activities
Part of MDL-59313.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d8cb461529b9a50ee3478be7295df98b014e897b
http://github.com/moodle/moodle/commit/d8cb461529b9a50ee3478be7295df98b014e897b
+ 3.4 en [hiddenwithbrackets,core]