Order items the same way as they are in GNOME3.

wiki/src/todo/better_power_off_button.mdwn

@@ -7,9 +7,9 @@ Many solutions were proposed, here's the one we will implement:
 Let's leave this button at the same top-right place; clicking it
 should open a dropdown menu with three entries:
 
+- Lock screen
 - Shutdown *immediately*
 - Reboot *immediately*
-- Lock screen
 
 This way: