Components properties schema

Open for discussion:
I've collected all the properties used within components and I've tried to group them all. 
Also, I've done some comments with the ones that, in my opinion, should be replaced.

So, guys, comment!!
i think that these two are not, in fact, the same.

`on_sale` is true if the item is on sale at all, `on_sale_here` is true only if the item is on sale in your current local currency