Migration to typescript: first step

Add vue cli typescript support
Rename .js to .ts
Use class and annotations in App and NavBar
Add tslint

js/src/main.ts

@@ -0,0 +1,43 @@
+// The Vue build version to load with the `import` command
+// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
+import Vue from 'vue';
+// import * as VueGoogleMaps from 'vue2-google-maps';
+import VueMarkdown from 'vue-markdown';
+import Vuetify from 'vuetify';
+import moment from 'moment';
+import GetTextPlugin from 'vue-gettext';
+import 'material-design-icons/iconfont/material-icons.css';
+import 'vuetify/dist/vuetify.min.css';
+import App from '@/App.vue';
+import router from '@/router';
+// import store from './store';
+import { createProvider } from './vue-apollo';
+
+const translations = require('@/i18n/translations.json');
+
+Vue.config.productionTip = false;
+
+Vue.use(VueMarkdown);
+Vue.use(Vuetify);
+
+const language = (window.navigator as any).userLanguage || window.navigator.language;
+moment.locale(language);
+
+Vue.filter('formatDate', value => (value ? moment(String(value)).format('LLLL') : null));
+Vue.filter('formatDay', value => (value ? moment(String(value)).format('LL') : null));
+
+Vue.use(GetTextPlugin, {
+  translations,
+  defaultLanguage: 'en_US',
+});
+
+Vue.config.language = language.replace('-', '_');
+
+/* eslint-disable no-new */
+new Vue({
+  router,
+  el: '#app',
+  template: '<App/>',
+  apolloProvider: createProvider(),
+  components: { App },
+});