Turn page while playing (#1383) fixes #1365

* Add an EReader setting for turning when playing

This allows to allow the navigation with the Volume buttons even when
audiobooks are playing.

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Co-authored-by: advplyr <advplyr@protonmail.com>

strings/zh-cn.json

@@ -179,8 +179,6 @@
   "LabelNarrator": "演播者",
   "LabelNarrators": "演播者",
   "LabelNavigateWithVolume": "使用音量键导航",
-  "LabelNavigateWithVolumeDisabled": "关闭",
-  "LabelNavigateWithVolumeEnabled": "打开",
   "LabelNavigateWithVolumeMirrored": "镜像",
   "LabelNever": "从不",
   "LabelNewestAuthors": "最新作者",
@@ -190,6 +188,7 @@
   "LabelNotStarted": "未开始",
   "LabelNumEpisodes": "{0} 个剧集",
   "LabelOff": "关闭",
+  "LabelOn": "打开",
   "LabelPassword": "密码",
   "LabelPath": "路径",
   "LabelPlaybackDirect": "直接播放",