🌐 Add Japanese translation for docs/ja/docs/tutorial/handling-errors.md

[SwftAlpc]

This PR translates the tutorial/handling-errors.md to Japanese.
Please review tutorial/handling-errors.md.

Issue #1571 generates a new directory to support Japanese.
PR #1656 generates a new directory for tutorial.
I will fix dependency after #1571 & #1656 are merged.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cf73051) 100.00% compared to head (afaf616) 100.00%.

❗ Current head afaf616 differs from pull request most recent head e3f638b. Consider uploading reports for the commit e3f638b to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #1953     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files          540       239    -301     
  Lines        13969      7079   -6890     
===========================================
- Hits         13969      7079   -6890     

see 356 files with indirect coverage changes

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[github-actions]

📝 Docs preview for commit 6716aa5 at: https://5f42329b442f8e770ec9c7df--fastapi.netlify.app

[tokusumi]

I found some typo and unnecessary symbol

[tokusumi]

レスポンス結果

[github-actions]

📝 Docs preview for commit 61fc57d at: https://5f4cbfe6281ab685a75f5ecc--fastapi.netlify.app

[SwftAlpc]

@tokusumi
Thanks for the review!
Cloud you check it out?

[github-actions]

📝 Docs preview for commit afaf616 at: https://5f9ae0261c44a8090023d396--fastapi.netlify.app

[tokusumi]

Your work is awesome. Thank you.

[tiangolo]

📝 Docs preview for commit e3f638b at: https://6499c40866a23b009bfcc170--fastapi.netlify.app

[alejsdev]

Thanks for your help! @SwftAlpc 😸

And thanks for reviewing @tokusumi 🔍🧐