Concept for user settings

Dear all,

as we discussed language as a parameter that ought to be considered I 
discovered that there seems to be more to it. In order not to lose this 
thought, I created https://github.com/w3c/voiceinteraction/issues/50

Maybe, we could discuss this as well in one of our meetings? Feel also 
free to comment, in case you feel like via email already.

I copied the contents here for your convenience

User settings may come into play at various occasions. Considering 
language as an example there are

  * Language setting provided with a user request
  * Language determined from the spoken or written utterance itself
  * Language stored in the IPA as a user preference
  * System default language

All these different sources have to be considered to continue with the 
correct setting.


Dirk