feat(App): uni.app.quit i18n

src/core/helpers/i18n/en.json

 {
+  "uni.app.quit": "Press back button again to exit",
   "uni.async.error": "The connection timed out, click the screen to try again.",
   "uni.showActionSheet.cancel": "Cancel",
   "uni.showToast.unpaired": "Please note showToast must be paired with hideToast",

src/core/helpers/i18n/es.json

 {
+  "uni.app.quit": "Pulse otra vez para salir",
   "uni.async.error": "Se agotó el tiempo de conexión, haga clic en la pantalla para volver a intentarlo.",
   "uni.showActionSheet.cancel": "Cancelar",
   "uni.showToast.unpaired": "Tenga en cuenta que showToast debe estar emparejado con hideToast",

src/core/helpers/i18n/fr.json

 {
+  "uni.app.quit": "Appuyez à nouveau pour quitter l'application",
   "uni.async.error": "La connexion a expiré, cliquez sur l'écran pour réessayer.",
   "uni.showActionSheet.cancel": "Annuler",
   "uni.showToast.unpaired": "Veuillez noter que showToast doit être associé à hideToast",

src/core/helpers/i18n/zh-Hans.json

 {
+  "uni.app.quit": "再按一次退出应用",
   "uni.async.error": "连接服务器超时，点击屏幕重试",
   "uni.showActionSheet.cancel": "取消",
   "uni.showToast.unpaired": "请注意 showToast 与 hideToast 必须配对使用",

src/core/helpers/i18n/zh-Hant.json

 {
+  "uni.app.quit": "再按一次退出應用",
   "uni.async.error": "連接服務器超時，點擊屏幕重試",
   "uni.showActionSheet.cancel": "取消",
   "uni.showToast.unpaired": "請注意 showToast 與 hideToast 必須配對使用",

src/platforms/app-plus/service/api/route/navigate-back.js

@@ -15,12 +15,16 @@ import {
   closeWebview
 } from './util'
 
+import {
+  t
+} from 'uni-core/helpers/i18n'
+
 let firstBackTime = 0
 
 function quit () {
   if (!firstBackTime) {
     firstBackTime = Date.now()
-    plus.nativeUI.toast('再按一次退出应用')
+    plus.nativeUI.toast(t('uni.app.quit'))
     setTimeout(() => {
       firstBackTime = null
     }, 2000)