Added JA translation

[za]

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code.

Added JA translation.

[Secrus]

@za please fix tests and pre-commit issues.

[za]

Hi @Secrus I've reformatted using black and now it's passed. Can you give me hint about the isort pre-commit check?

isort....................................................................Failed
- hook id: isort
- files were modified by this hook

Fixing /code/tests/localization/test_ja.py
Skipped 70 files

I am following the other test file and we're only importing one module which is pendulum.

[Secrus]

pre-commit.ci autofix

[za]

Thanks for the review and merging the PR @Secrus !