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The "icon" you're looking for is the checkbox button. The label shouldn't change title though, since a checkbox button indicate "true" when checked, and "false" when unchecked. Changing the label would only lead to confusion, and you wouldn't want that.
I am left-handed and do swap my mouse buttons (otherwise, how could I primary click with my index finger, as the mouse is clearly designed to be used), and I do find it confusing when instructions say right click/left click. I have to stop in my tracks and mentally reverse them, or think something like click/opposite click (come to think of it, not a bad ...
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