Well... I'm not fluent in any sign language.
I can only say a few words and sentences.
I know some letters of the "sign language alphabet" (or at least those are the ones I never forget), which are C, F, I, J, L, O and Y.
In Danish sign language, I can only say the sentence that I learned in a Danish TV show for children, "Mom and dad say that it is forbidden to pee on the carrots". (I know this sentence is so random)
I know how to say some words and sentences in Faroese sign languages, like "milk", "tea", "book", "read", "I don't know" and "thank you".
In American sign language, I can say "thank you" and "I love you"
In Korean sign language, I can say "I love you", "I like you" and "thank you".
I once learned the word "mountain" in Chinese Sign Language, and it almost looks like you're flipping the bird at someone (but having your pinky up too) and it also looks like 山.