I think it is a mistake to identify a movie according to its language, as if movies were literature.
When you create a movie, you create something in your image.
If you make a movie about Elizabeth I, how much of the dialogue is her real words? Audiences know when they go see a movie that it is fiction.
The financing of my films has always been international.
To do the writing, I have to have time to do research.
When a French book becomes an international hit it is because of the author and not because of the language. The same goes for movies.