I aplogize if I am incorrect here, but I've never added another language to my software.\
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This is my guess though. You'd have to make a copy of the English language directory, and convert "Variable Value" of each file to Maori and place that new (Maori) Directory under your Language Directory.\
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Then click Prepare All Available Languages.\
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You'd have to be very carefull not to convert any of the Variable Name fields though. I "think" they have to remain in English.