In version 6.1, support for traditional Chinese (zh-TW) was added.

Reply: In version 6.5 released today, are translations faster for you?

Reply: I believe it seems to be slower because the page is translated in one go. And not while scrolling the page.
I will add the option to use widgets instead of my algorithm.

Original:
This extension emerged this year and is gradually evolving. And it was easy to use for a long time, which version did you use before?
I recently stopped using the Google and Yandex widgets and started using my own algorithm on the pages, and this algorithm sends the texts to Google Or Yandex servers. I did this because some pages were not translated with widgets and to ensure more privacy.
During translation Google inverts some words, it is complicated to implement this in my algorithm, so some words are not in the right position.
About translation speed. Yandex translates slower, check in the settings which translation engine is using. If you are using Google and are slow it may be because the translations are done by (translate.googleapis.com) which is an American server. When the translations used the widget, perhaps it was used a server closer.
I'll add a way to use widgets instead of the new algorithms.

Obrigado pela análise. Atualmente quando se traduz nem o Google e nem Yandex possuem acesso ao cookies ou URL da página. Apenas aos textos das páginas.

You can use crowdin.
https://crowdin.com/project/translate-web-pages