Sling TV is adding more channels to its Internet TV service, by rebranding an existing Dish product. DishWorld has been turned into Sling International, providing close to 200 channels in 18 languages, for $15 per month. While Sling International has its own app, complete with the new Sling TV interface, customers who subscribe to both Sling TV and Sling International will be able to access channels from both subscriptions from within the same app.