Al-Bari' b. 'Azib reported that the Messenger of Allah ﷺ observed Qunut in the morning and evening (prayers).
Qunut can be done in any language but it is best if it is done in Arabic since this was the language spoken by Prophet Muhammad himself when he performed qunut during his prayers. Furthermore, reciting qunut helps one to focus more on their prayer since they are actively engaging with what they are saying instead of just repeating words without understanding them or thinking about them deeply enough.