Portuguese

Siem, nos podemos

German

Ja, wir konnen
(pronounced "yah, veer kernen")

Chinese (Mandarin)

Just like Japanese, one would never start a sentence with "yes," so this translates as "We Can."

Japanese

Translates as "We Can" because in Japanese one would never start a sentence with the word "yes."

Hindi

"Hum Yea Kur Sak Thay Hai"

French

Oui, on peut

Spanish

Sí, se puede
(pronounced "see, say pweh-day")

English

Yes We Can