zh_hans/zh_hant is not suitable. e.g., there're Traditional Chinese mainland, Traditional Chinese HK, and Traditional Chinese TW for the zh_hant. Simplified Chinese is only for mainland users meanwhile.
Plz use zh_CN, zh_TW/HK instead.

BTW, the existing packs having been made include zh_CN, zh_HK, zh_TW, zh_yue.

The question above has been solved, ignored.