Acceptance Criteria
First "Explore" view should have "light content" style:
Subsequent views (languages & analytics) should have "default" style
Dev notes
We're not using viewcontroller-based status bar appearance, so this will have to be toggled manually. I suggest we hook into UINavigationControllerDelegate methods in WMFBoringNavigationTransition to toggle status bar updates manually—using the view-controller-based status bar API.
Also, I would rename WMFBoringNavigationTransition to something welcome-specific :-P