The language docs[1] are CN. Chromium's (and Chrome's?) Translate menu option works well. Alternately, most pages in the table of contents have code for skimming untranslated. One can also cut and paste to translation sites, but giving urls to translate.google (and baidu, yandex) yield blank pages.
There is a language spec pdf, as a link and inline, on page [2]. It's readable, being code dense, but also CN. I don't know how to easily translate it - chromium browser translation, and translate.google, don't seem to.
[1] https://developer.huawei.com/consumer/cn/doc/openharmony-can... [2] https://developer.huawei.com/consumer/cn/doc/openharmony-can...