Back in stock timescale (e.g. "available in N days")

[mariannk]

There should be a field for "Back in stock timescale". This would allow the Administrator to enter a value in day/weeks/months that would indicate how long it would take to be back in stock. From an Customer's point of view, if an Item was out of stock the message could say something like "Out of Stock, available in 10-14 days".

This field should be localizable. I think it's better to implement it the same way as "Delivery dates" (new entity). Or just a new localizable field for products? Let's discuss first