Add lang ja

[matheo-2001]

Japanese lang added

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6bde2b2) 96.80% compared to head (61a6ac1) 96.76%.
Report is 4 commits behind head on v3.0.

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Additional details and impacted files

@@             Coverage Diff              @@
##               v3.0     #613      +/-   ##
============================================
- Coverage     96.80%   96.76%   -0.05%     
  Complexity      266      266              
============================================
  Files            34       34              
  Lines          1126     1112      -14     
============================================
- Hits           1090     1076      -14     
  Misses           36       36              

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