Opt In Email Localization
Select a language in the left column and see the changes per language selected. Now we'll walk through how to achieve this.
You can name your list in any language under in Opt In Lists/Categories where you'll find something like the image below. You may also add a description fro each list in your specified language.

If you have a multi-language site, you can define which newsletter will be available for each language. In the image below, we're selecting a newsletter for the French language option.

Under Layout Settings, you can edit various sections that your users will see on your page.

You can do the same thing for all System Emails as shown in the image below:
