Use action texts for buttons of confirmation dialog

src/kmailtransport/widgets/transportmanagementwidget.cpp

@@ -128,7 +128,9 @@ void TransportManagementWidgetPrivate::removeClicked()
     }
     const int rc = KMessageBox::questionYesNo(q,
                                               i18n("Do you want to remove outgoing account '%1'?", ui.transportList->currentItem()->text(0)),
-                                              i18n("Remove outgoing account?"));
+                                              i18n("Remove outgoing account?"),
+                                              KStandardGuiItem::remove(),
+                                              KStandardGuiItem::cancel());
     if (rc == KMessageBox::No) {
         return;
     }