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/es.json

@@ -179,8 +179,6 @@
   "LabelNarrator": "Narrador",
   "LabelNarrators": "Narradores",
   "LabelNavigateWithVolume": "Navegar con las teclas de volumen",
-  "LabelNavigateWithVolumeDisabled": "Apagar",
-  "LabelNavigateWithVolumeEnabled": "Encender",
   "LabelNavigateWithVolumeMirrored": "Espejo",
   "LabelNever": "Nunca",
   "LabelNewestAuthors": "Autores más recientes",
@@ -190,6 +188,7 @@
   "LabelNotStarted": "Sin iniciar",
   "LabelNumEpisodes": "{0} episodios",
   "LabelOff": "Apagado",
+  "LabelOn": "Encendido",
   "LabelPassword": "Contraseña",
   "LabelPath": "Ruta de carpeta",
   "LabelPlaybackDirect": "Directo",