15. The system of claim 14 , wherein the list of actions comprises a dropdown menu having one or more menu items corresponding to the list of actions that may be performed on the currency value to convert the currency value to the destination type of currency, and wherein the action plug-in is further operative to: determine a current user interface language setting for the application program; and to generate the menu items of the dropdown menu in a language specified by the current user interface language setting.
15. The system of claim 14 , wherein the list of actions comprises a dropdown menu having one or more menu items corresponding to the list of actions that may be performed on the currency value to convert the currency value to the destination type of currency, and wherein the action plug-in is further operative to: determine a current user interface language setting for the application program; and to generate the menu items of the dropdown menu in a language specified by the current user interface language setting. 18. The system of claim 15 wherein the application program comprises a spreadsheet application program, wherein the electronic document comprises a spreadsheet having one or more cells, and wherein the action plug-in is further operative to maintain a per cell undo stack, thereby permitting the replacement of converted currency values with currency values on a per cell basis.