[firebase_ml_vision] language support

[HosseinArabbeigi]

Please add support for all languages like chines, to flutter firebase_ml_vision library.
Isn't implemented yet??

[Ehesp]

Hello - this is a feature request for Firebase rather than this library. Please create one if it is still an issue: https://firebase.google.com/support/troubleshooter/report/features/

Thanks!