Notification of string changes

Author: Victor Deniz Falcon
MDL-64636 analytics: new course_completion target
Added new target to predict which students are at risk of not meeting
the course completion criteria.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=03fce0a71d5b8e0984b32777a50c7c8cbc47bec1
http://github.com/moodle/moodle/commit/03fce0a71d5b8e0984b32777a50c7c8cbc47bec1

+ 3.7 en [target:coursecompletion,core]
+ 3.7 en [target:coursecompletion_help,core]
+ 3.7 en [targetlabelstudentcompletionno,core]
+ 3.7 en [targetlabelstudentcompletionyes,core]