If I have time, I will try again ...
I'm not far from a good result but it's not possible to just take an icon and put him, it was my goal (because original wow icon are square and my button's shape is circular).
But if the icon that we will take is redrawn with circular shape, it will work. One will be obliged to use a drawing software but I think that I can perhaps propose you an other mean.
It will come in another version ...
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