Xcode string catalogs.
Ever since macOS shipped in 2000 as Mac OS X, Apple’s development environments have allowed developers to easily localize text (strings) in their apps using two Apple technologies: language-specific bundles, and .strings files.
Localization is the process of translating app string files into multiple languages for use in many countries. Developers can decide which languages to localize Strings files into so that when an app runs, it automatically loads the correct .strings file for the current system language.
Go Here to Read this Fast! How to use Xcode String catalogs to localize your app
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How to use Xcode String catalogs to localize your app