We have indeed made subtitles available for videos and course content in many languages!
When viewing a YouTube video in a course, click on the "CC" in the lower right corner to activate subtitles in several languages. Available captions and languages will vary by video.
If you'd like to contribute captions to our videos through the translation tool Amara, check out code.org/translate/videos for a list of videos needing translations! We'd greatly appreciate the help!