Author: David Mudrák
MDL-35238 Inform the admin if the update can not be deployed due to write permissions
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0daa642894c21179cbc96f810ffccbe2a2bbc733
http://github.com/moodle/moodle/commit/0daa642894c21179cbc96f810ffccbe2a2bbc733
+ 2.4 en [notwritable,core_plugin]
+ 2.4 en [notwritable_help,core_plugin]