Add Chinese translation

[cscainiao]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

[codecov-io]

Codecov Report

Merging #7477 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7477   +/-   ##
=======================================
  Coverage   65.42%   65.42%           
=======================================
  Files         435      435           
  Lines       21323    21323           
  Branches     2347     2347           
=======================================
  Hits        13950    13950           
  Misses       7257     7257           
  Partials      116      116

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[graceguo-supercat]

messages.json is generated from .po file right? you don't have to commit .json file.

[cscainiao]

@graceguo-supercat i see