Ratings in WYPS and OSKI

I wonder why there is only one ranking for these games, because they are offered in many different languages.
I would find it fairer, if each language would have it's own ranking. I like to play them in English to polish up my vocabulary, but of course my ability in my native language German is much better.
But every time I lose a game in English, my German rating decreases too.

What do you think about language-specific ratings?

Sorry, I just found out, that there ARE separate ratings for each language.
My error, I apologize!