Fixes a case where the locale selector don't show up in Chrome when using
'webspeech' provider.
And adds missing fields to the webspeech transcription messages, after the
addition of some new parameters to those messages with the open
transcription server.
Add a server-side app for the audio captions feature and record proto-events
for this data.
As it is, only behaves as a pass-through module. The idea is to include all
the business intelligence in this app.
