[kcmkwin/kwindecoration] Use clearer text for "Menu" decoration button

src/kcmkwin/kwindecoration/declarative-plugin/buttonsmodel.cpp

@@ -51,7 +51,7 @@ static QString buttonToName(DecorationButtonType type)
 {
     switch (type) {
         case DecorationButtonType::Menu:
-            return i18n("Menu");
+            return i18n("More actions for this window");
         case DecorationButtonType::ApplicationMenu:
             return i18n("Application menu");
         case DecorationButtonType::OnAllDesktops: