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/en-us.json

@@ -179,9 +179,10 @@
   "LabelNarrator": "Narrator",
   "LabelNarrators": "Narrators",
   "LabelNavigateWithVolume": "Navigate with volume keys",
-  "LabelNavigateWithVolumeDisabled": "Off",
-  "LabelNavigateWithVolumeEnabled": "On",
   "LabelNavigateWithVolumeMirrored": "Mirrored",
+  "LabelNavigateWithVolumeWhilePlaying": "Allow volume keys to navigate while playing",
+  "LabelNavigateWithVolumeWhilePlayingDisabled": "Off",
+  "LabelNavigateWithVolumeWhilePlayingEnabled": "On",
   "LabelNever": "Never",
   "LabelNewestAuthors": "Newest Authors",
   "LabelNewestEpisodes": "Newest Episodes",
@@ -190,6 +191,7 @@
   "LabelNotStarted": "Not Started",
   "LabelNumEpisodes": "{0} episodes",
   "LabelOff": "Off",
+  "LabelOn": "On",
   "LabelPassword": "Password",
   "LabelPath": "Path",
   "LabelPlaybackDirect": "Direct",