feat: add ja-JP locale

[oizhaolei]

add a new language: ja-JP

[codecov]

Codecov Report

Base: 89.90% // Head: 89.91% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (5ad3d90) compared to base (9a959ad).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5707   +/-   ##
=======================================
  Coverage   89.90%   89.91%           
=======================================
  Files         296      297    +1     
  Lines        6327     6333    +6     
  Branches     1551     1551           
=======================================
+ Hits         5688     5694    +6     
  Misses        590      590           
  Partials       49       49           

Impacted Files	Coverage Δ
src/locales/ja-JP.ts	100.00% <100.00%> (ø)

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