Move remaining actions over to use redux and v4 endpoints (#6720)

webapp/components/root.jsx

@@ -3,7 +3,7 @@
 
 import * as GlobalActions from 'actions/global_actions.jsx';
 import LocalizationStore from 'stores/localization_store.jsx';
-import Client from 'client/web_client.jsx';
+import {Client4} from 'mattermost-redux/client';
 
 import {IntlProvider} from 'react-intl';
 
@@ -85,7 +85,7 @@ export default class Root extends React.Component {
     localizationChanged() {
         const locale = LocalizationStore.getLocale();
 
-        Client.setAcceptLanguage(locale);
+        Client4.setAcceptLanguage(locale);
         this.setState({locale, translations: LocalizationStore.getTranslations()});
     }