Create a system able to clean fields

[teolemon]

Some contributors add invalid values like:

• "Not indicated", "Non précisé / Inconnu / Non indiqué"
• Emojis

Add a cleaning button able to perform some common checks and cleans.

[CharlesNepote]

Main need seems to be the possibility to clean nutrition facts table.

[CharlesNepote]

Many checks and features have been added to Product Opener, this issue is not useful any more.