Joining language names

I find that language names are now being standardized to the English form
for all languages. I think that that's a bad change. On nl: we had bg:
in Bulgarian. It is now English. We had languages in the local encoding.
We now get the Latin between brackets added without reason. And in some
cases ('Simplified Chinese') that's in English again, not in local language
or Dutch. Some languages (sv:, pl:) used local form. Not possible any
more. Who decided for all languages that English is the best here?

Andre Engels