At this time, most edX courses are in English. Some courses are offered in other languages with English subtitles available for the videos.
When you enroll in a course, you can check the course description page to determine which languages are offered for that specific course:
We are hoping to include many other languages in our courses in the near future. For translation assistance, we recommend a tool such as Google Translate.
Please note that course language availability is determined by the individual course teams. You can change the language of the edX platform from your account settings, but this will not change the language of course content.