I don't understand what difference it makes being in Klingon? usually Captchas are just jibberish anyway. Recognizing individual letters remains the challenge.
As best I can tell, the klingon used wasn't even in a latin font. So the correct answers were essentially translating arbitrary symbols into their associated numbers. Certainly throws off what I was assuming from the blog read.
They do note that the service, ImageToText, was the most expensive by far.