Notification of string changes

Author: Frederic Massart
MDL-29409 repository_alfresco: Drop support for URL/link
The current solution has two major issues. Firstly, it is using the
session key in the file URL, allowing anyone with the link to steal
the identify of the poster. Secondly, the links are not presistent
and become broken as soon as the server is restarted. Let's not
support this any more until a proper solution is found in MDL-26454.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=4bc5dd32178cbaa62c466f74bf6d0ebafb697818
http://github.com/moodle/moodle/commit/4bc5dd32178cbaa62c466f74bf6d0ebafb697818

+ 2.4 en [security_key_notice_message_small,repository_alfresco]
+ 2.4 en [security_key_notice_message_subject,repository_alfresco]
+ 2.4 en [security_key_notice_message_content,repository_alfresco]