Icon missing on Panel Action Buttons

[jEsuSdA 8)]

Hi!

¿Could anyone tell me the name of the icon for "reboot" using on Action 
Buttons plugin ?

Since I update to 4.12 the reboot icon does not match the previous 
versions name, and it falls back to the ugly default one.

Here you can see a screenshot: 
http://www.pasteall.org/pic/show.php?id=88895  (the icon missing is 
marked as red).

Please, help me. ;)
Thanks!