No need to resubmit your app for review to update strings or translations anymore. Use Lokalise iOS framework and get your app localized with a few lines of code.
Over-the-air (OTA) localization
Change application language – select any language that is supported by project local localization.
Test localizations - create pre-release OTA localization bundles for your application. No need to recompile sources. Once the bundles are generated (at Lokalise Download page), see project settings to control versions and pre-release status.