fix(design): set default language to zhCN

[jikkai]

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Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 29.57%. Comparing base (7a28a43) to head (21a68db).

❗ Current head 21a68db differs from pull request most recent head 63ce4b5. Consider uploading reports for the commit 63ce4b5 to get more accurate results

Files	Patch %	Lines
...es/design/src/components/date-picker/DatePanel.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1863   +/-   ##
=======================================
  Coverage   29.57%   29.57%           
=======================================
  Files        1163     1163           
  Lines       63135    63135           
  Branches    13277    13277           
=======================================
  Hits        18675    18675           
  Misses      44460    44460           

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