added arabic localization

service-worker.js

@@ -53,7 +53,11 @@ const i18n = {
   'zh-TW': {
     'new_message': "新訊息",
     'new_chat': "新聊天",
-  }
+  },
+  'ar': {
+    'new_message': "رسالة جديدة",
+    'new_chat': "محادثة جديدة",
+  },
 };
 
 self.i18nMessage = function (id) {
@@ -119,7 +123,8 @@ self.addEventListener('notificationclick', event => {
 
   event.waitUntil(self.clients.matchAll({
     type: 'window',
-    includeUncontrolled: true})
+    includeUncontrolled: true
+  })
     .then(windowClients => {
       let anyClient = null;
       for (let i = 0; i < windowClients.length; i++) {