Currently voice and language are passed from the frontend to the WikispeechListenApi.
It should however be possible to set these inside the WikispeechListenApi instead. In addition to simplifying the API calls this should also be beneficial for e.g. T164252
Note that we still want to require voice and language in the case where revisionId is not provided. Also lang will be needed whenever a voice is provided to the api (to validate it)