VLC player doesn't seem to be completely language independent. I haven't checked completely which parts are installed only using whatever locale was in use during installation (there are several places), but it is a fact that some parts do not change from preferences UI language selection while most parts do. However different languages for those missing parts do exists, because if you change your locale before install then those parts also change language.
It would be nice if the player installation asks for UI language during install, or alternatively player should be completely language independent so that everything in UI is changed when you select different language from menu.