II' using my Oasis to learn Chinese, and recently inbuilt internet translator wouldn't work at all. All it says is "there's a problem, please update your kindle", but my Kindle's OS is up to date ("update kindle" button in settings is faded). Dictionaries work fine, but I really need the translation of the full phrases to get the relations between words right. I've also reset the settings today, but to no avail.
Update: it seems that the only two languages not supported by the translator are Chinese simplified and traditional. My kindle is on Chinese simplified settings, and the function of translating the Chinese text into English was there before.
It's not in one book, and the translator works with every other language, for example if changed to Japanese source text language (Japanese share some of the Chinese characters) it works perfectly fine.