Notification of string changes

Author: David Mudrák
MDL-36903 Verify the SSL certificate of available updates provider
From now on, Moodle verifies the available updates provider server. To
make it work, either there must be a valid CA certificate available in
the operating system, or the administrator has to upload the valid CA
certificate to moodledata/moodleorgca.crt (PEM format) file manually.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=4785c45dd809fb561ce1ec6b7d07735526f6c15c
http://github.com/moodle/moodle/commit/4785c45dd809fb561ce1ec6b7d07735526f6c15c

+ 2.4 en [err_response_curl,core_plugin]
+ 2.4 en [err_response_http_code,core_plugin]