Use the new nutrients.pl API to show the right default nutrition editing fields for all countries in the world

[teolemon]

What

Use the new nutrients.pl API to show the right default nutrition editing fields for all countries in the world
eg: https://fr.openfoodfacts.org/cgi/nutrients.pl
eg: https://us.openfoodfacts.org/cgi/nutrients.pl

1. according to the country of the product if it is sold in just one country
2. according to the country of the phone if it is one of the several countries where sold
3. according to the first country where sold if the country of the phone does not match any of the countries where sold

Example of improvements this approach would bring

• Always display transfat when country is set to United States
• Always display added sugars when country is set to United States
• Always display cholesterol when country is set to United States

Part of

• Improve editing (Tracker) #4166