If you've ever accidentally switched an app's language to Mandarin when you only speak English, it may seem too overwhelming to fix. Fortunately, you can reverse follow the steps above to recover your native language and keep going by following the location of where each Setting is. But, the fastest, easiest way to recover your native language is to simply uninstall the app and reinstall it. Doing this will give you the option to select the language you'd like on the first page. Problem fixed.