Privacy : show price owner only on the price detail page

[raphodn]

Story

Thanks to #795 we have a new page where we could display metadata below the Price Card, with info like

• the price addition date
• the price owner
• the price edit history (one day ?)

This would allow :

• to gain some px space in the Price Card
• hide the price owner and be a bit more privacy-concerned

Todo

• [x] Price detail page : see issue #795
• [x] Price detail history : #806
• [ ] Prood detail history