Quite interesting, I was curious to find whether it applied to Chinese where words like the, a ... are not used that is you when you say "I read the book" in Chinese there is no "the" it's literally "I read book".
Investigations are more difficult since a word in Chinese may be represented by one or more characters so that you can't just do stats on the character usage alone, instead you need to understand the context.
The trick is to use words low on the zips meter so that you'll get more precise hits.
For the search above I used "Chinese zipf law" and it came up on the second hit.
It may be that google uses this trick to improve its search results too but I don't know that. Anyway you might gain some insight from Google search presentation which I just found by luck:
it was also curious that your video had a chart of zipf applied to the mysterious voynich book which has yet to be translated or even proven to be a real document.