MDL-41820 XSS in the quiz responses report.

Thanks to Michael Hess for finding this bug and reporting it to us.
MDL-41941 clean message text
MDL-41807 repository_filesystem: Prevent access to parent directories
MDL-38743 add private cache headers
Automatically generated installer lang files
Merge branch 'install_23_STABLE' of git://git.moodle.org/moodle-install into MOODLE_23_STABLE
weekly release 2.3.9+
MDL-42780 remove YUI2 uploader
MDL-42780 Disable swf files in YUI2.

These swf files are attack vectors for XSS attacks and upstream no longer maintains them.
Moodle release 2.3.10
Automatically generated installer lang files
Automatically generated installer lang files
Automatically generated installer lang files
weekly release 2.3.10+
NOBUG: Fix version comment to stable correct alt