Vietnamese Translation for MetaMask Browser Extension

• Initial translation: MetaMask/metamask-extension#3602
• Source: https://docs.google.com/spreadsheets/d/1XVf83zc_Vejg45hjBct39l3RlQncgJp5CPKzRmIVDro/edit#gid=932405037
• Upcoming translations to track the file en/messages.json

TODO

• Add new translations for https://github.com/MetaMask/metamask-extension/commits/master/app/_locales/en/messages.json
• Suggest a better way to coordinate changes and update translations for MetaMask

Credits

• Translator: Trang Ha
• Editor: Viet Le