feat(i18n): add japanese translations

[ykzts]

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[codecov]

Codecov Report

Merging #408 (5560b8b) into main (d3c4bb1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #408   +/-   ##
=======================================
  Coverage   75.18%   75.18%           
=======================================
  Files           6        6           
  Lines         133      133           
=======================================
  Hits          100      100           
  Misses         23       23           
  Partials       10       10           

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