We've learned in ASL how to say I am happy, you are sad, and he is angry.
Let's learn how to say they are excited.
To say "they" you point you finger off to the right and draw a circle, like you're pointing out a group of people.
To say "excited" you start with your hands open, palms facing your body and your thumbs pointing up.
Take turns moving your right and left hands up and down almost like you are excited and shaking your hands.
ASL Nook - Your feelings in ASL - Sheena McFeely
(from: wikipedia - american sign language)
Italian: Sono eccitati
German: Sie sind aufgeregt
Spanish: Ellos estan emocionados
French: Ils sont excité