This is cosmetic, but OK/Cancel dialog boxes are really Not Cool (tm), because there is some extra cognitive load in figuring out what "OK" does. All the major platform's user interface guidelines recommend labeling buttons with active verbs relevant to the action - in this case "Thanks".
[An action this harmless should not even have a confirmation dialog, just undo instead. But I realize having an undo option is probably a lot of work, so not going to file that request now.]
Version: unspecified
Severity: trivial