Be more granular about the fact that the product is not complete

[teolemon]

We currently show a nudge when the product is not complete, to entice them to slide up and collaborate. Some users complain that they don't know what to complete (this is especially true when the Nutri-Score is completed, and that there are no Robotoff questions). The case shown above is all the more specific that it is a jam, which appears not to have ingredients (or unrecognized ingredients). Other cases might include coffees with the "no ingredients" checkbox not ticked.
We should be more granular about the fact that the product is not complete, and point out:
"Ingredients, nutrition and XXX need to be completed"
"We need a photo of the ingredients"
"We need newer photos"