Default page’s lang="fr" confuses auto-translation extension

My [Firefox Translations](https://addons.mozilla.org/en-US/firefox/addon/firefox-translations/) extension thinks that the State of CSS website is in French

Well, because it is by default when it comes from the server:

```html

```

Later, when it’s ”hydrated” it gets `lang="en_US"`, but it’s too late for the extension

I wonder if the default `lang` should be something else, or just not set.