Fix/android voice call (#16180)

* fix(android): handle missing audio permission in voice calls

- Avoid stop errors when voice capture was never started
- Dispatch voice call error dialogs on the main thread
- Explain how to enable Audio capture on the Screen share page

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(android): restore audio after failed voice call switches

* fix: translations

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix: translatin

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix(i18n): match UI label capitalization in translated messages

Signed-off-by: fufesou <linlong1266@gmail.com>

---------

Signed-off-by: fufesou <linlong1266@gmail.com>
Co-authored-by: RustDesk <71636191+rustdesk@users.noreply.github.com>

src/lang/eu.rs

@@ -780,5 +780,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("RustDesk could not load a GStreamer component needed for screen capture ({})", "RustDesk-ek ezin izan du pantaila kapturatzeko beharrezkoa den GStreamer osagai bat kargatu ({})"),
         ("Relay fallback delay in seconds", "Errelera itzultzeko atzerapena segundotan"),
         ("relay-fallback-delay-tip", "Dagoeneko ezarritako errele-konexio batek WebRTC konexio zuzenari zenbat denbora itxaroten dion, haren ordez erabili aurretik. Handitu konexio zuzen motel bati denbora gehiago emateko; txikitu konexio zuzena egin ezin den sareetan lehenago errelera itzultzeko. Utzi hutsik 2.5 segundoko balio lehenetsirako."),
+        ("To start a voice call, enable \"Audio capture\" on the \"Screen share\" page.", "")
     ].iter().cloned().collect();
 }