As you know, we have `zh-CN` locale too. Please merge from `master`!

> Missing translation entity

> Warning: Localizations must include a translated copy of each entity from each file in the reference locale. The required files may vary from target application to target application.

> Missing Entities: variable.PlatformChangeset.description, variable.TabGroup.description
chrome/locale/zh-CN//chrome/locale/zh-CN/variables.properties