Add Icons to better visually distinguish buttons

[MatteCrystal]

I often find myself mis clicking and or otherwise being slowed down making sure i click the right add before or after button. Adding icons instead of words for these buttons might help solve this and cut down on UI space occupied.

If you add these icons adding icons for some the the other buttons might also be helpful. For example I also often accidently click save style instead of styles in order to open the styles dialog which is annoying.