You would change the second pair. Don't change the first with capital letters. You do not need to change any if the modules files other than the language. However, if manually manipulate the English language file and update the module, you'll lose the translation. That's why it would be better to use Joomla's native language override feature. http://docs.joomla.org/J2.5:Language_Overrides_in_Joomla
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