adding subtitles

This feature is not yet available, but should be there before the next edition of this course. Most videos of this course are stored on Vimeo (this makes them accessible for Chinese participants, who cannot access Youtube). On the present page, however, we will put links to Youtube-copies of all videos. If someone wants to add subtitles to a particular video (in English, or translated into your language), this can be done via the dedicated tool in Youtube. (more info will follow once the links are there)