Localization is the process of making your app support other languages. In this tutorial, I make a simple app with English user interface first and then localized the app to other language such as Russian, Japanese or ETC.. I use XCODE Version: 8.3.3 for implement the project.
Complete Tutorial Avaiable Here:: https://medium.com/@lalaovu/localization-tutorial-for-ios-project-2ec518699dc9