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At the moment locales is restricted to elements that have a content property. This includes action, quote, and text elements. Locales take the following interface: 
interface Locales {
  [locale: string]: {
    content: string;
  };
}
When a "locale" is specified in the message.to field, each element that has content for that "locale" will have their top level content property replaced by the locale specific content. 
{
  "message": {
    "to": {
      "email": "person@example.com",
      "locale": "eu-fr"
    },
    "content": {
      "version": "2022-01-01",
      "elements": [
        {
          "type": "text",
          "content": "Hello",
          "locales": {
            "eu-fr": {
              "content": "Bonjour"
            }
          }
        }
      ]
    }
  }
}
In the above example, Hello would be replaced with Bonjour.