The Qur'an can be translated into every language of the world but this does not mean the Last Messenger knew every language.
English? The mind boggles at what they are suggesting!
Three: It has been revealed in the clear Arabic of its times. [12:2, 19:97, 20:113, 39:28, 44:58]
The Prophet (S), who was born and raised in Makkah (Mecca), belonged to the prominent Quraish tribe. Since the Makkans were the first audience, the Qur’an was revealed in their dialect.
Messengers were sent to their own people, spoke their own language.