The titles and descriptions for all of the locales that your app is available in are pulled automatically, and the appropriate ones will be displayed based on people's locations.

Note: This applies to the ad previews that you'll see when creating ads as well. For example, if your app has localised titles in English and French and you're creating the ad in France, the ad preview will only show in French, even if you're targeting a country other than France. But the actual ad will display in the language of the person viewing it.

* Nguồn: Facebook