Good evening.

American Sign Language:
Good http://commtechlab.msu.edu/sites/aslweb/G/W1475.htm
Evening http://commtechlab.msu.edu/sites/aslweb/E/W1130.htm

English:
Good evening.

French:
Bonsoir.
Bonne soirée.

Italian:
Buona sera.

Spanish:
Buenas tardes.

Swahili:
Masalkheri.