If you need to decode something in Gnommish, the fairy language in the book series Artemis Fowl, this is the project you're looking for. Drag the characters into the order of the message (you need to click on the characters twice before dragging--I'm sorry, I don't know how to fix that), press "translate", and see your message convert itself to English. To write a message in Gnommish, press "translate", click & drag your message, then click "Gnommish". Reload to reset it.
Note: I give myself credit for decoding the alphabet. I did not use the website, https://artemisfowl.com to decode it. I used the comparisons in the first book to do it myself. Thanks to Eoin Colfer for writing Artemis Fowl.