Pontoon: Update Chinese (China) (zh-CN) localization of AMO Frontend
Pontoon: Update Chinese (China) (zh-CN) localization of AMO Frontend

Localization authors:
- 우믿트 <eloli@foxmail.com>

kumar303/addons-frontend,tsl143/addons-frontend,mozilla/addons-frontend,mozilla/addons-frontend,tsl143/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,kumar303/addons-frontend,kumar303/addons-frontend,mozilla/addons-frontend