This tutorial assumes you already know how to create a chrome extension. learn how Localizing Your Chrome Extension: An Easy Tutorial.
This tutorial assumes you already know how to create a chrome extension. If not, you can head to my other tutorial to learn how to do that.
Step 1: Changing Manifest.json
Step 2: Translation Strings
Step 3: Use The Localized Strings
Step 4 (optional): Changing the CSS Direction Based on The Locale