This is not auto-translation. Rather, it's an API developers can use to add inline translation to web apps. For example, under a comment in your app, you can

This is not auto-translation. Rather, it's an API developers can use to add inline translation to web apps. For example, under a comment in your app, you can (a) detect the language, and (b) if it's different from the current users/browsers language, offer to translate it with a small link (c) if the user clicks the link, the content is translated to their language.