Hi, I am a Kindle Scribe user, and I need to send some homemade EPUB content to my Kindle. This content includes Traditional Chinese, Simplified Chinese, Japanese, and English. Currently, through my testing, when sending to Kindle via web and email, documents in English, Japanese, and Simplified Chinese are well-recognized and automatically use the corresponding Simplified Chinese, English, and Japanese fonts. However, upon testing, I found that when I send a Traditional Chinese EPUB document with the language code "zh-TW" to Kindle, Kindle still uses the default Simplified Chinese font. This is despite the fact that nowhere in the metadata is it declared that the file language is Simplified Chinese, and the document is written in Traditional Chinese. Although I can solve the incorrect language-font correspondence by changing the font, it becomes very cumbersome to switch fonts among books and documents in different languages, as I use four languages.
I hope to find a solution here, thank you very much.
Ps1: I have already tried declaring the language as "zh-tw" in the EPUB's .opf file, but this is ineffective.
Ps2: I have tried converting it locally to KFX format and copying it into Kindle, but since EPUB is the primary e-book distribution format, this is obviously too complicated.