In another bug someone said:
> About the colors, I would say simply that I do not understand these. Colors
> have meaning, they are bound to a brand, a product or a level of information
> (danger, warning, info, success, ...). Here, why restart is blue and logout
> purple? Why shutdown is red? I cannot explain these colors, so, it appears
> to me that they are nor necessary, nor wanted. It is more a disruption in
> the graphical user interface than anything else. 
> Furthermore, it was more consistent with the others things in the dashboard
> where the things in color were the applications and the things without
> colors the actions possibles (filter applications and shut the system). 

I think this is right: what is the meaning of theses colors? I have troubles to see what the buttons do so I have either to read or to strongly focus on the small symbol in the button.

The one before where very readable I think. 

Reproducible: Always