====== onTranscription() ======
wrtc.onTranscription() occurs when a call receives voice to text transcription.

You can use this event to add subtitles to the video feed from the user.

===== Occurs =====
When the voice to text service has decoded a user's speech and delivered a piece of transcription of it.

===== Arguments =====
wrtc.onTranscription(call, text, from)
  * call - [[ixnx:wrtc:js:api:call:start|call]] object raising the event (undefined if transcripting yourself)
  * text - string containing a piece of transcription
  * from - string containing the address name of the decoded user

===== Example =====
You can use wrtc.onTranscription() either to build a transcription of a call by piecing multiple wrtc.onTranscription() events together to a complete transcript, or to add subtitles to the video feed of remote users:

<code>
var transcript = "";
var prev_from;
wrtc.onTranscription = function(callobj, text, from) {
	// Transcription:
	if (from != prev_from)
		transcript += "\r\n\r\n" + from + ": " + text;
	else
		transcript += " " + text;
	// Subtitles:
	if (callobj) {
		callobj.user.subtitles.innerHTML = text;
		wrtc.setTimeout(callobj, ".user.subtitles.innerHTML=\"\"", 3000 + text.length * 200);
	}
}
</code>

Create and add a .user.subtitles field to the call object in [[ixnx:wrtc:js:api:wrtc:onnewcallobject|wrtc.onNewCallObject()]]