With many thanks to @hongtang (Chinese) and Tomoaki Masuda (Japanese), we now have translations for lesson 1! Additional lessons in Chinese and Japanese are, I understand, coming soon.
If you can help translate the lessons into any language, we’d be most grateful. You can contribute to any of our videos through Youtube’s system: https://support.google.com/youtube/answer/6054623?hl=en
(If you do add translations to a video, please let me know, since I have to hit ‘publish’ to have them actually appear.)