MDL-73364 core: add missing lang string for my courses viewed event.

lang/en/moodle.php

@@ -815,6 +815,7 @@
 $string['eventdashboardviewed'] = 'Dashboard viewed';
 $string['eventdatabasetextfieldcontentreplaced'] = 'Database global search and replace';
 $string['eventemailfailed'] = 'Email failed to send';
+$string['eventmycoursesviewed'] = 'My courses viewed';
 $string['eventname'] = 'Event name';
 $string['eventrecentactivityviewed'] = 'Recent activity viewed';
 $string['eventsearchindexed'] = 'Search data indexed';