Refactoring of i18n (#3165)

Refactoring of i18n

src/client/app/mobile/views/pages/messaging-room.vue

@@ -10,9 +10,11 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import i18n from '../../../i18n';
 import parseAcct from '../../../../../misc/acct/parse';
 
 export default Vue.extend({
+	i18n: i18n(),
 	data() {
 		return {
 			fetching: true,
@@ -47,7 +49,7 @@ export default Vue.extend({
 				this.user = user;
 				this.fetching = false;
 
-				document.title = `%i18n:@messaging%: ${Vue.filter('userName')(this.user)} | ${(this as any).os.instanceName}`;
+				document.title = `${this.$t('@.messaging')}: ${Vue.filter('userName')(this.user)} | ${(this as any).os.instanceName}`;
 			});
 		}
 	}