Author: Paul Holden
MDL-73364 core: add missing lang string for my courses viewed event.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=83903f137e208d4226b7b3a67e441f2cdde1a308
http://github.com/moodle/moodle/commit/83903f137e208d4226b7b3a67e441f2cdde1a308
+ 4.0 en [eventmycoursesviewed,core]