In itunesconnect, go to your app details and then version details. In the upper right corner, click the "Manage Locations" button.
Here you can add all the version information of the application for each localization that you want to support. This includes the name of the application (display name in iTunes), a description of which new ones, keywords, etc.
See the iTunes Connect Developer's Guide , Adding a New Localization, page 63 for more information.
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