Missing languages for published field in APIv2 for Touristic Content

[Chatewgne]

Describe the bug

On /touristic_content/ route on APIv2, we find :

      ...
      "published": true,
      ...

but it should look like this :

      ...
      "published": {
        "fr": true
        "en": true,
        "it": false
      },
      ...

This prevents from publishing or not depending on the language in Geotrek Aggregator.