Add support for edition of multilingual and/or free-text fields

[teolemon]

Who for

• App users who encounter a product without name
• App users who are adding a new product

Why

• The name and quantity of the product have no immediate purpose for the user, yet they are essential for:
  • Search
  • ML detection of the category
  • They will clutter the addition UI and are error prone.
• Common name can be omitted from mobile and serving size can be grouped in the nutrition widget, and linked to a track mode feature.

What

Those fields work in a similar fashion

• Add the ability to add basic details if they are not available #903
  • Product name (multilingual) (free text)
  • Common name (multilingual) (free text)
  • Quantity (monolingual ?) (free text)
• Nutrition input (Tracker) #511
  • Add the ability to input the serving size (monolingual free text) #2522

Part of

• Implement improved contribution flow in app #505

[M123-dev]

P2 because there were multiple requests for this

[teolemon]

@M123-dev I've created #2514
Can I close this one ?

[teolemon]

Fixed