Comment 18 for bug 287154

Well, fair point. Cultures have all sorts of different color-norms, and my statements about yellow=warning do not apply everywhere either. But black is a particularly bad choice for the pencil because it is the same color as the text, helping the 'exclamation point' interpretation. And red or yellow pencil icon can be shown based on whether your locale is _GB or not. :)

I guess a wrench is pretty universal, in both shape and color (please tell me nobody has bent purple wrenches). +1 for wrench because it doesn't need localization. :)