Notification of string changes

Author: Petr Škoda
MDL-39088 migrate editor uninstallation to plugin_manager


http://git.moodle.org/gw?p=moodle.git;a=commit;h=b07526e8def45edb5d73a8910e331346cabc79bd
http://github.com/moodle/moodle/commit/b07526e8def45edb5d73a8910e331346cabc79bd

- 2.6 en [editordeleteconfirm,core_editor]