site: hide language changer online

site/component/Header/index.jsx

@@ -146,9 +146,13 @@ export default class Header extends React.Component {
                 {options}
               </Select>
             </div>
+            {
+              location.port ? (
                 <Button id="lang" type="ghost" size="small" onClick={this.handleLangChange}>
                   <FormattedMessage id="app.header.lang" />
                 </Button>
+              ) : null
+            }
             <Menu mode={this.state.menuMode} selectedKeys={[activeMenuItem]} id="nav">
               <Menu.Item key="home">
                 <Link to="/">