The following files are officially served by Udacity and should be accessible even if YouTube is blocked or if you simply want offline access.
Video files are numbered and zipped per unit and contain a playlist file for convenience. You can use, for example, the VLC player to play them. With VLC, you can play back the videos faster or slower (the tone itself will be the same) by pressing the "+" or "-" key.
In case you want to verify the integrity of these files after downloading, you can get the md5sum file for this class here.
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For the videos online, you can fix the subtitles if you see an error. If you're really ambitious, you can add a translation in another language. The steps for editing are: