I am happy.

American Sign Language:
I am http://commtechlab.msu.edu/sites/aslweb/I/W1707.htm
happy. http://commtechlab.msu.edu/sites/aslweb/H/W1568.htm

English:
I am happy.

French:
Je suis heureux. (male)
Je suis heureuse. (female)

Italian:
Sono felice.

Spanish:
Estoy alegre.

Swahili:
Habari yangu nzuri.