tagged version 2.3.1
Merged r11757 from trunk.
Updates for 2.3.1 release.
Merged r11592 from trunk.
Merged r11754 from trunk (#12684).
Pevents duplicate accesskeys (#12684).
Restores the bottom action menu.
Merged r11750 from trunk (#12650).
Fixed: Lost text after selection in issue list with IE (#12650).