Update Japanese translation

[inductor]

This PR adds some translation to the Japanese language.

Updated a few strings after executing make extracted based on the translation guide.

[k8s-ci-robot]

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[codecov-io]

Codecov Report

Merging #6339 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6339   +/-   ##
=======================================
  Coverage   38.35%   38.35%           
=======================================
  Files         124      124           
  Lines        8370     8370           
=======================================
  Hits         3210     3210           
  Misses       4738     4738           
  Partials      422      422

[inductor]

/assign @josedonizetti

[oke-py]

I'm a member of kubernetes/sig-docs-ja-reviews. Translation LGTM.

[tstromberg]

Thank you!