metamask-extension/docs/translating-guide.md

MetaMask Translation Guide

The MetaMask browser extension supports new translations added in the form of new locales files added in app/_locales.

• The MDN Guide to Internationalizing Extensions

Adding a new Language

Each supported language is represented by a folder in app/_locales whose name is that language's subtag (look up a language subtag using this tool).

Inside that folder there should be a messages.json file that follows the specified format. An easy way to start your translation is to first duplicate app/_locales/en/messages.json (the english translation), and then update the message key for each in-app message.

That's it! When MetaMask is loaded on a computer with that language set as the system language, they will see your translation instead of the default one.

Testing

To verify that your translation works, you will need to build a local copy of MetaMask.