Title says it all really: the language (or is it lang?) parameter which works on a lot of endpoints doesn’t seem to be documented anywhere in the new version of the documentation. If it is documented, I apologise, however I couldn’t find it using the search?
As an aside, the search doesn’t seem to reset to the top of the page as you navigate using the numbers at the bottom - I had to manually scroll back to the top to read pages 2 and 3, etc.