Optimized wiki code (#2566)

* optimized path component

* abstract component

* repair copy bug

* move copy&move&download to list-item

* add modal portal

frontend/src/components/main-content-wrapper.js

@@ -16,7 +16,7 @@ const MainContentWrapper = (WrapperedComponent) => {
         </Fragment>
       );
     }
-  }
-}
+  };
+};
 
 export default MainContentWrapper;