See you later.

American Sign Language:
See http://commtechlab.msu.edu/sites/aslweb/S/W3532.htm
you http://commtechlab.msu.edu/sites/aslweb/Y/W4550.htm
soon. http://commtechlab.msu.edu/sites/aslweb/S/W3754.htm

English:
See you later.

French:
A bientôt.
À tout à l'heure.

Italian:
A più tardi.
Arrivederci.

Spanish:
Hasta luego.

Swahili:
Kwaheri.