There's an open ticket for languages other than English! https://gitlab.com/smoores/storyteller/-/issues/10. If you want to take a look, please do! I don't have any contributing guidelines yet, unfortunately, but they'll probably come soon. I think Whisper does have Cantonese and Mandarin support, so it should be possible to add support for those languages, though we'll have to look into nltk support for sentence tokenization as well!