Add local per-member radio mute controls on desktop and Android

tools/chatgui-android/app/src/main/res/values/strings.xml

@@ -45,6 +45,9 @@
     <string name="radio_ptt">"PTT radio"</string>
     <string name="radio_overlay_description">"Radio PTT overlay"</string>
     <string name="radio_active">"Radio is active"</string>
+    <string name="radio_member_mute">Mute this member in radio</string>
+    <string name="radio_member_listen">Listen to this member in radio</string>
+    <string name="radio_member_mute_failed">Cannot change radio listening setting</string>
     <string name="radio_notification">"Radio: PTT / automatic voice transmission"</string>
     <string name="overlay_stopped">"Floating button stopped"</string>
     <string name="ongoing_call">"Ongoing call"</string>