Reach a local audience through your marketing. Well-localized marketing materials make it easier for users to learn about your app, and will help to ensure that your app appears relevant to your audience. Research local social networks in which to spread the word about your app, as these may vary significantly across markets.
Use the Download on the App Store badge in your app marketing communications as a clear call to action to download your app. The badge is available in 40 localizations, and it’s another simple thing you can do to make your app stand out to a broader audience. View the App Store Marketing Guidelines.
With Apple technologies, it’s easy to create localized apps that perform seamlessly on iOS and macOS regardless of language. Take advantage of Auto Layout to automatically adjust the dimensions and layouts of views, extensive Unicode support to work with text from any language, the powerful text-handling technologies of Cocoa and Cocoa Touch to display, lay out, and edit text in many languages, and much more.
WWDC Session Videos
Documentation and Sample Code
iOS Developer Library
Mac Developer Library
Apple Developer Forums
Ask questions and discuss localization with Apple engineers and other developers.