title: Swift 3 (Xcode 8 beta 6) localizedStringWithFormat
body: <p>Is there a better way to get a localized format and substitute strings in with Xcode 8 Swift 3?  Do I need to use NSString, and cast back and forth between NSString and String?</p>
  
  <pre><code>let localizedDue = NSString.localizedStringWithFormat(NSLocalizedString("Due: %@", comment: "due date label with date") as NSString, formattedDate) as String
  </code></pre>