The site is designed to support French and English but the "system" language is French.
If you are unable to view the site in English when you click on the link, it's probably because you block the language cookie. In fact, this is a very simple cookie containing only one parameter : the language. So you should accept this cookie.
The cookie can be blocked by your web browser or by programs such as firewalls. So, check these programs to accept the cookie.
If you need help, feel free to write me.