Correct, English is the very top, only way to reach it for me is to drag the browser way out in the bottom. Nothing I can do about that, this is transifex, maybe see if they have some bug reports/requests for that?
EDIT:
I was wrong, I could adjust the css, scrollbars are now added, max height of the language picker is set to 500 px, let me know if that is low enough, or if you think it should be 400-450 px max.