In /app/code/core/Mage/Checkout/controllers/CartController.php I see:

       'Coupon code "%s" is not valid.',

In my theme's translate.csv I have added:

"Mage_Checkout::Coupon code ""%s"" was applied.","test"
"Coupon code ""%s"" is not valid.","test"

If I edit the controller code directly, it works. The translate.csv does not work -- it still outputs the original text, 'Coupon code "blah" is not valid.'.

I even tried editing the translation in app/locale/en_US/Mage_Checkout.csv but it didn't work either.

What have I missed? Shouldn't it be outputting "test" ??

1 Answer 1


To be sure, you should add the translation scope (i.e. the module name) to both translations:

"Mage_Checkout::Coupon code ""%s"" was applied.","test"
"Mage_Checkout::Coupon code ""%s"" is not valid.","test"

Don't forget to clean the cache after changing translations.

  • It was the cache needing to be cleared! Thank you for reminding me.
    – Justin
    Aug 13, 2015 at 15:45
  • By the way, it does not need the Mage_Checkout:: scope for this particular translation.
    – Justin
    Aug 13, 2015 at 15:46
  • Yes, as long as it is globally unique (see magento.stackexchange.com/a/78483/243) Aug 13, 2015 at 15:47

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