I've added Chinese. However i couldn't find a dictionary for it yet, and it might need a custom font for Chinese characters. DeepL works with it as well. If it has issues, I will fix it soon.
I'll release a v0.4 update tomorrow or after. It makes a lot of things more simpler, I would recommend to wait for it before you install it. After that update I'll work on Chinese dictionaries and issues. It will take 1-2 days. It will have two built-in dictionaries for Chinese: cc-cedict and wiktionary.