nutrition

The Accessibility Foundation has made an accessibility of the Open Food Facts web site. There is a number of issues that they pointed out and that we should fix.

Report OpenFoodFact 15-12-2020.pdf

Who would be interested in fixing some of them?

Describe the bug
The field corresponding to the API parameter "energy-kj" is missing in the Nutriments class. According to @stephanegigandet this parameter may be used to set the kJ value for a product

For comparison, the Nutriments class has a "energy-kcal" field:

Add a button to scan 1st product on empty lists

Reviewing #159 I saw some odd behavior locally with plenty of credits left in proten... switched to master and the behavior is there too, so not introduced by 159, just happened to first notice while looking there

Adding one item to cart was (eventually) causing other items to show max-allowed... don't have time to find a clean/minimal reproduction, but likely a bug with recent JS changes to