So I read the Dragonology (2003) book recently, and I directly translated every instance of the dragon language from the book. If you have the book yourself, I recommend translating it yourself, since that's part of the fun. But if it takes too much time or you're just curious (or any other reason, really), here's every translation listed in order of appearance. (there are some intentional spelling errors within the book)
(not my picture)
Book cover:
Drakes complete book of dragons.
Language exercises:
I cannot give you heart ar health yet men dragans think me...
The heir of Lambton cursed be for catching such as fish as me and though he caut me in a well at Lambton Hall I now do dwell.
Forty feet below two million pounds are buried.
My treasure is in the billabong under the shade of the coolibah tree.
...wealth as cold as stone yet harder too you find me where you hear I do.
Secret Spell:
Grind the tail feather of a phoenix with some unicorn spittle. Take this mixture to the mouth of an old cave. Draw a circle on the ground and cast the mixture round it. Saying the magic words "dextray sinistray admey". The spell causes a dragon to come who will serve you for nine months. Be careful to pronounce the words correctly or it may turn the dragon against you.