Added parameters to showConfirmationDialog

src/main/java/no/ntnu/idatt1002/demo/controller/FinanceController.java

@@ -42,7 +42,7 @@ public interface FinanceController {
    * Returns an optional, which is a popup alert box, asking for confirmation for deleting an entry.
    * @return An alert box, asking for confirmation for deleting the selected entry of the tableview.
    */
-  Optional<ButtonType> showConfirmationDialog();
+  Optional<ButtonType> showConfirmationDialog(String title, String header, String content);
 
   /**
    * Saves the changes made to the tableview by writing the information to a file.