Default productName and languages

[monsieurtanuki]

Description

Starting about 3 days ago, the unit tests don't pass anymore, cf. https://github.com/monsieurtanuki/openfoodfacts-dart/actions/runs/6653878935/job/18080780143

When we ask for the product_name, we expect it to match the language (lc) when relevant.

In the following case, that means we expected product_name to be "Pfannkuchen", as we ask for a German localization and there's a localization in German.
https://world.openfoodfacts.net/api/v3/product/2222222222225?fields=code,product_name,product_name_languages&lc=de&cc=de

{
    "code": "2222222222225",
    "errors": [],
    "product": {
        "code": "2222222222225",
        "product_name": "Pancakes",
        "product_name_languages": {
            "de": "Pfannkuchen",
            "en": "Pancakes",
            "ru": "Блинчики"
        }
    },
    "result": {
        "id": "product_found",
        "lc_name": "Produkt gefunden",
        "name": "Product found"
    },
    "status": "success",
    "warnings": []
}

Expected behavior

We expect the unit tests to pass.
Other solution: if the business rules changed regarding the default language for product_name, we need to reflect that in our unit tests.

[monsieurtanuki]

@stephanegigandet Has something recently changed regarding the default product_name when several translations are available?

[monsieurtanuki]

Maybe related to openfoodfacts/smooth-app#4672