Discount type for ecommerce

Adds a new discount type to ecommerce discounts which allows more specific discounts with discount code.

You can give following rules for the discount

• All products, specific products or specific product sets
• Based on matched products give discount by total price or total quantity
• And based on that number give discount for amount or percent by different ranges

Use examples:

• If wanted to sell products in a certain product set with a tiered price.
• You can also do all products based tiered price by leaving coupon code empty. Then it will be enabled to all customers. 

Includes language file and finnish translation.