title: How Thread.CurrentCulture/UICulture are affected when using AsyncController
body: <p>I've read that AsyncController split the handling of a request between more than one thread.
  Currently, we set the current thread's CurrentCulture and CurrentUICulture on the beginning of the request.</p>
  
  <p>How wil this be handled in AsyncController when threads are switched in the middle of the request handling?</p>