Keep the Radio tuning dial silent unless a stream is playing

Releasing the tuning dial always started the chosen station, plus tuning
static, even when nothing was playing. It now follows the Previous/Next
rule: the release plays only if a stream was loading, buffering or playing
when the drag began; otherwise it just selects the station.

The privacy note no longer lists finishing tuning as a way to connect and
now names voice instead, in all locales. Docs, changelog and comments are
tightened to match.

src/i18n/locales/es.json

@@ -450,7 +450,7 @@
   "Radio volume": "Volumen de Radio",
   "Radio off": "Radio desactivada",
   "STATION SITE": "SITIO DE LA EMISORA",
-  "Audio connects directly to the broadcaster when you press play, finish tuning or choose a station on the globe. Your IP is visible to that broadcaster.": "El audio se conecta directamente con la emisora al pulsar ESCUCHAR, terminar de sintonizar o elegir una emisora en el globo. Tu IP es visible para esa emisora.",
+  "Audio connects directly to the broadcaster when you press play, choose a station on the globe or ask voice to play. Your IP is visible to that broadcaster.": "El audio se conecta directamente con la emisora al pulsar ESCUCHAR, elegir una emisora en el globo o pedirlo por voz. Tu IP es visible para esa emisora.",
   "LOADING": "CARGANDO",
   "DEGRADED": "DEGRADADO",
   "STALE": "DESACTUALIZADO",