adjust responsive for a create page button of the nav bar

src/client/js/components/Navbar/PageCreateButton.jsx

@@ -20,7 +20,7 @@ const PageCreateButton = (props) => {
   return (
     <button className="nav-link create-page border-0 bg-transparent" type="button" onClick={appContainer.openPageCreateModal}>
       <i className="icon-pencil mr-2"></i>
-      <span>{ t('New') }</span>
+      <span className="d-none d-xl-block">{ t('New') }</span>
     </button>
   );
 };