fix(nav): improve back exit behavior

lib/i18n/zh.i18n.json

@@ -52,9 +52,6 @@
     "mute": "静音",
     "ok": "确定",
     "reconnect": "重新连接",
-    "exitConfirmTitle": "退出应用？",
-    "exitConfirmMessage": "确定要退出吗？",
-    "dontAskAgain": "不再询问",
     "exit": "退出",
     "viewAll": "查看全部",
     "checkingNetwork": "正在检查网络...",
@@ -64,7 +61,8 @@
     "startingOfflineMode": "正在启动离线模式...",
     "loading": "加载中...",
     "fullscreen": "全屏",
-    "exitFullscreen": "退出全屏"
+    "exitFullscreen": "退出全屏",
+    "pressBackAgainToExit": "再按一次返回退出"
   },
   "screens": {
     "licenses": "许可证",
@@ -252,8 +250,6 @@
     "tunneledPlaybackDescription": "使用硬件加速视频通道。如果在 HDR 内容上看到黑屏但有声音，请禁用此选项",
     "requireProfileSelectionOnOpen": "打开应用时询问配置文件",
     "requireProfileSelectionOnOpenDescription": "每次打开应用时显示配置文件选择",
-    "confirmExitOnBack": "退出前确认",
-    "confirmExitOnBackDescription": "按返回键退出应用时显示确认对话框",
     "forceTvMode": "强制 TV 模式",
     "forceTvModeDescription": "无论自动检测结果如何都使用 TV 布局。适用于未报告 leanback 功能的 Android TV 设备。更改后将重启应用。",
     "startInFullscreen": "以全屏模式启动",