You would need to write a set of scripts to do the import.
You have two tables: coupons and coupons_description
"coupons" contains all the main info for the coupons:
coupon_id
coupon_type
coupon_code
coupon_amount
coupon_minimum_order
coupon_start_date
coupon_expire_date
uses_per_coupon
uses_per_user
restrict_to_products
restrict_to_categories
restrict_to_customers
coupon_active
and "coupons_description" contains the name and description, for each supported language on your site:
coupon_id
language_id
coupon_name
coupon_description
coupon_id must be the same in each table for each coupon.
Here's one possible method:
http://www.zen-cart.com/forum/showthread.php?t=14096
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