Remove refs to counterpart

and remove extCounterpart which is unnecessary now we just use a
single counterpart instance

src/vector/index.js

@@ -55,8 +55,6 @@ if (process.env.NODE_ENV !== 'production') {
 
 var RunModernizrTests = require("./modernizr"); // this side-effects a global
 var ReactDOM = require("react-dom");
-// Workaround for broken export
-import * as counterpart from 'counterpart-riot';
 var sdk = require("matrix-react-sdk");
 var PlatformPeg = require("matrix-react-sdk/lib/PlatformPeg");
 sdk.loadSkin(require('../component-index'));
@@ -317,7 +315,7 @@ async function loadApp() {
 async function loadLanguage() {
     const lang = UserSettingsStore.getLocalSetting('language', languageHandler.getLanguageFromBrowser());
     const languages = languageHandler.getNormalizedLanguageKeys(lang);
-    languageHandler.setLanguage(languages, counterpart);
+    languageHandler.setLanguage(languages);
 }
 
 loadApp();