fix(locale): correct Japanese country names

[matsueushi]

Reviewed and corrected country names in Japanese.

• Removed old/obsolete country names.
• Fixed spelling mistakes.
• Unified country names that were split into two parts.
• Removed regions such as Scotland and Wales that are not independent countries.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (c15da8e) to head (bc9bc4e).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3510      +/-   ##
==========================================
- Coverage   99.97%   99.97%   -0.01%     
==========================================
  Files        2880     2880              
  Lines      220507   220503       -4     
  Branches      951      951              
==========================================
- Hits       220454   220448       -6     
- Misses         53       55       +2     

Files with missing lines	Coverage Δ
src/locales/ja/location/country.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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