Label tweaks for device listing

// FREEBIE

Signal/src/call/CallAudioService.swift

@@ -22,7 +22,15 @@ struct AudioSource: Hashable {
     }
 
     init(portDescription: AVAudioSessionPortDescription) {
-        self.init(localizedName: portDescription.portName,
+
+        // portDescription.portName works well for BT linked devices, but if we are using
+        // the built in mic, we have "iPhone Microphone" which is a little awkward.
+        // In that case, instead we prefer just the model name e.g. "iPhone" or "iPad"
+        let localizedName = portDescription.portType == AVAudioSessionPortBuiltInMic ?
+            UIDevice.current.localizedModel :
+            portDescription.portName
+
+        self.init(localizedName: localizedName,
                   image:#imageLiteral(resourceName: "button_phone_white"), // TODO
                   isBuiltInSpeaker: false,
                   portDescription: portDescription)

Signal/translations/en.lproj/Localizable.strings

@@ -140,7 +140,7 @@
 "ATTACHMENT_TYPE_VOICE_MESSAGE" = "Voice Message";
 
 /* action sheet button title to enable built in speaker during a call */
-"AUDIO_ROUTE_BUILT_IN_SPEAKER" = "Built in Speaker";
+"AUDIO_ROUTE_BUILT_IN_SPEAKER" = "Speaker";
 
 /* An explanation of the consequences of blocking another user. */
 "BLOCK_BEHAVIOR_EXPLANATION" = "Blocked users will not be able to call you or send you messages.";