Update Japanese translation

[shu-mutou]

No description provided.

[codecov]

Codecov Report

Merging #5023 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5023      +/-   ##
==========================================
- Coverage   45.42%   45.41%   -0.01%     
==========================================
  Files         214      214              
  Lines       10078    10078              
  Branches      100      100              
==========================================
- Hits         4578     4577       -1     
- Misses       5232     5233       +1     
  Partials      268      268

Impacted Files	Coverage Δ
...p/backend/integration/metric/common/aggregation.go	89.09% <0%> (-1.82%)	⬇️

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[atoato88]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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