Looks like english from here. Perhaps you need to set your browser language default setting to English(EN) rather than English(US) or English(GB)?
Also the standard way Debian does their webpages seems to be xxxx.en.html, xxxx.fr.html, etc. I just checked and you can definately force it to English by going to http://www.debian.org/releases/2.2/i386/install.en.html
I always end up with Polish, if it's any consolation.