Can't get into lessons for HTML & CSS Beginners

I’ve been taking the HTML & CSS beginners course. I’m coming towards the end–I’m at CSS Selectors: Sorting Your Friends Section. I can’t seem to get in the course. The screen is frozen and I can’t scroll or click anything after I click into that lesson. Its been like this all day. I’ve tried Chrome and FireFox and its the same issue. When I get to the main site, there’s a weird message in the header: "You are currently viewing the site in العربية. This may affect your progress. Click Here to return to English. "
I’ve cleared cache for both browsers–still the same issue and both Chrome and Firefox are up to date. Is anybody else having issues with this site and how can it be fixed? Thanks!

The same problem here. At earlier stage of the same course. Can’t find a solution!