Anne,
On the discount coupon page where customers can look up the status of a code, it says "BUTTON_LOOKUP_ALT" where I'm guessing it should say "Submit" or "Lookup".
I used the Developer's Toolkit and found this in a file called tpl_discount_coupon_default but I have no clue as to what and where I should edit, so that the proper wording shows up.
Please help if you can! Thanks