OK, this is a real nitpick. Some of us are more picky than others
In the Action List dialog there is a feature to find out if a specific key combination is already assigned as a shortcut. When you enter a key combination that is not already assigned you get a small dialog saying "Shortcut not found". This dialog has the heading "Error".
That dialog should not have the heading "Error".
It should simply say, "Not found" (or something similar).