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.

---------

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

strings/cs.json

@@ -176,8 +176,6 @@
   "LabelNarrator": "Vypravěč",
   "LabelNarrators": "Vypravěči",
   "LabelNavigateWithVolume": "Navigace pomocí tlačítek hlasitosti",
-  "LabelNavigateWithVolumeDisabled": "Vypnuto",
-  "LabelNavigateWithVolumeEnabled": "Zapnuto",
   "LabelNavigateWithVolumeMirrored": "Zrcadleno",
   "LabelNever": "Nikdy",
   "LabelNewestAuthors": "Nejnovější autoři",
@@ -186,6 +184,7 @@
   "LabelNotFinished": "Nedokončeno",
   "LabelNotStarted": "Nezahájeno",
   "LabelOff": "Vypnout",
+  "LabelOn": "Zapnuto",
   "LabelPassword": "Heslo",
   "LabelPath": "Cesta",
   "LabelPlaybackDirect": "Přímé",