I am a front end developer trying to figure out how to override
So I can change the coupon code error text, can anyone please guide me on how I would do this the correct way?
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You can add a transltion CSV-file to your theme folder:
"Coupon code %s was applied.","Your customized string"
Or for a specific translation
"Mage_XmlConnect::Coupon code %s was applied.","Your customized string"
en_US with the language code you need