ServiceWorker: Grab the notification and display it with i18n.

src/sw.js

 /* eslint-env serviceworker */
 
 import localForage from 'localforage'
+import { parseNotification } from './services/entity_normalizer/entity_normalizer.service.js'
+import { prepareNotificationObject } from './services/notification_utils/notification_utils.js'
+import Vue from 'vue'
+import VueI18n from 'vue-i18n'
+
+const messages = {
+  ar: require('./i18n/ar.json'),
+  ca: require('./i18n/ca.json'),
+  cs: require('./i18n/cs.json'),
+  de: require('./i18n/de.json'),
+  eo: require('./i18n/eo.json'),
+  es: require('./i18n/es.json'),
+  et: require('./i18n/et.json'),
+  eu: require('./i18n/eu.json'),
+  fi: require('./i18n/fi.json'),
+  fr: require('./i18n/fr.json'),
+  ga: require('./i18n/ga.json'),
+  he: require('./i18n/he.json'),
+  hu: require('./i18n/hu.json'),
+  it: require('./i18n/it.json'),
+  ja: require('./i18n/ja_pedantic.json'),
+  ja_easy: require('./i18n/ja_easy.json'),
+  ko: require('./i18n/ko.json'),
+  nb: require('./i18n/nb.json'),
+  nl: require('./i18n/nl.json'),
+  oc: require('./i18n/oc.json'),
+  pl: require('./i18n/pl.json'),
+  pt: require('./i18n/pt.json'),
+  ro: require('./i18n/ro.json'),
+  ru: require('./i18n/ru.json'),
+  te: require('./i18n/te.json'),
+  zh: require('./i18n/zh.json'),
+  en: require('./i18n/en.json')
+}
+
+Vue.use(VueI18n)
+const i18n = new VueI18n({
+  // By default, use the browser locale, we will update it if neccessary
+  locale: 'en',
+  fallbackLocale: 'en',
+  messages
+})
 
 function isEnabled () {
   return localForage.getItem('vuex-lz')
@@ -12,15 +54,33 @@ function getWindowClients () {
     .then((clientList) => clientList.filter(({ type }) => type === 'window'))
 }
 
-self.addEventListener('push', (event) => {
-  if (event.data) {
-    event.waitUntil(isEnabled().then((isEnabled) => {
-      return isEnabled && getWindowClients().then((list) => {
-        const data = event.data.json()
+const setLocale = async () => {
+  const state = await localForage.getItem('vuex-lz')
+  const locale = state.config.interfaceLanguage || 'en'
+  i18n.locale = locale
+}
+
+const maybeShowNotification = async (event) => {
+  const enabled = await isEnabled()
+  const activeClients = await getWindowClients()
+  await setLocale()
+  if (enabled && activeClients) {
+    const data = event.data.json()
 
-        if (list.length === 0) return self.registration.showNotification(data.title, data)
-      })
-    }))
+    const url = `${self.registration.scope}api/v1/notifications/${data.notification_id}`
+    const notification = await fetch(url, { headers: { Authorization: 'Bearer ' + data.access_token } })
+    let nj = await notification.json()
+    nj = parseNotification(nj)
+
+    const res = prepareNotificationObject(nj, i18n)
+
+    self.registration.showNotification(res.title, res)
+  }
+}
+
+self.addEventListener('push', async (event) => {
+  if (event.data) {
+    event.waitUntil(maybeShowNotification(event))
   }
 })