It seems https://check.torproject.org/ does not follow the browser prefered language setting. I understand that the browser default might be set to prefer english for privacy but if the user chooses a prefered language would it not be ok for the website to use that language so the user does not have to select it in the language list? Just an idea i dont really use Tor Browser i just test it and se how well things are translated and of course if i translate the strings on the website i would like for the users to be able to see the strings.