Feature Request: Add Cart Coupon Rules, Custom Error Messages

[seansan]

Would it be an idea to allow custom error messages on a rule level in the core?

• create field on rule level
• maybe? make it for multiple languages (this makes it a little more difficult)
• ability to allow %s for echo of the code itself (optional)
• if field is empty revert to original message
• qua code would need definition of new field (maybe also tab)
• in code use if/else to retrieve new field, if exist use it, else use default

So suppose we have a discount code XXX that is valid above value of 180 usd ... then instead of reporting "This discount code is invalid" we could show "This discount code is valid for a value greater than 180 usd" or at least something more specific