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Heeling is pushing on the back of the grip with the "heel" of the palm in anticipation of recoil.
Thumbing is pushing on the gun with the thumb while pulling the trigger. This is common as the trigger finger and thumb are trained to work together.
Too much trigger finger means that the trigger finger has been pushed through the trigger guard too far. This means that the trigger finger is curled around the trigger more than it should be. Instead of pulling straight back, the curling of the trigger finger will pull the gun to one side.
Too little trigger finger means that the trigger finger isn't far enough into the trigger guard. This means that the trigger finger is pushing on the side of the trigger instead of pushing directly backwards. This will cause the gun to be pushed to one side.
I know that's not exactly a translation, but perhaps the more thorough explanation will help make sense of the chart.
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