fix(lang): update Japanese translations

[wseymour15]

Description

Updating a few Japanese translations based on Brightcove's Japanese support team's suggestions.

Specific Changes proposed

• A few updated translations
• Update translations needed file

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #8190 (83e247b) into main (35c539d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #8190   +/-   ##
=======================================
  Coverage   82.11%   82.11%           
=======================================
  Files         112      112           
  Lines        7402     7402           
  Branches     1785     1785           
=======================================
  Hits         6078     6078           
  Misses       1324     1324           

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[gkatsev]

Should be merged as fix, not a chore