region: Make Add/Done buttons blue

https://bugzilla.gnome.org/show_bug.cgi?id=737966
common: Make Done button in language chooser blue

https://bugzilla.gnome.org/show_bug.cgi?id=737966
power: Disable hover on non-clickable rows

https://bugzilla.gnome.org/show_bug.cgi?id=733264
universal-access: Disable hover on non-clickable rows

https://bugzilla.gnome.org/show_bug.cgi?id=733264