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_Hant.json

@@ -176,8 +176,6 @@
   "LabelNarrator": "講述者",
   "LabelNarrators": "講述者",
   "LabelNavigateWithVolume": "使用音量鍵導航",
-  "LabelNavigateWithVolumeDisabled": "關閉",
-  "LabelNavigateWithVolumeEnabled": "打開",
   "LabelNavigateWithVolumeMirrored": "鏡像",
   "LabelNever": "從不",
   "LabelNewestAuthors": "最新作者",
@@ -186,6 +184,7 @@
   "LabelNotFinished": "未聽完",
   "LabelNotStarted": "未開始",
   "LabelOff": "關閉",
+  "LabelOn": "打開",
   "LabelPassword": "密碼",
   "LabelPath": "路徑",
   "LabelPlaybackDirect": "直接播放",