Notification of string changes

Author: David Mudrak
MDL-24507 support for the TinyMCE moodleemoticon plugin


http://git.moodle.org/gw?p=moodle.git;a=commit;h=b9fadae72dfa1b94020732a9e73e864d2cf8d284
http://github.com/moodle/moodle/commit/b9fadae72dfa1b94020732a9e73e864d2cf8d284

+ 2.0 en [moodleemoticon:desc,editor_tinymce]