Hi Nicolas,
I cant find the solution.
I even cant find any html class in the view you told it should be in.
The table of the quantity field is: hikashop_cart_product_quantity_value but that is not in that product/cart file.
Than my brains stops there 
Is it possible to hire you to change this option?
I want 2 things in Hikashop checkout page changed.
1. The quantity plus and minus added to the checkout page
2. I want the table of listing the image, title and price, quantity changed in div's,
I fi know the view i need to change i can do that but i cant find it.