The endpoint responds with the language defined by the accept-language headers instead of the one defined in the URL

[dtrucs]

If we call the same endpoint but with a different language in the URL
https://georiviereadmin.parc-haut-jura.fr/api/portal/fr/1/streams/1807/ or
https://georiviereadmin.parc-haut-jura.fr/api/portal/en/1/streams/1807/
I get the same result with JSON.

It returns the response with the accept-language headers defined by the sender (the browser, NodeJS, etc.). For testing purposes, you can change your browser's default language and refresh one of the above URLs to see the translations.

The API should not be interested in the sender's language, but in the language explicitly defined in the endpoint URL.

[submarcos]

There is no traslation mecanism. So, even If I implement it, there is no "en" language defined, so all language used respond with default language defined