Add Japanese translations for `Faker::Sports::Football`.

[yamat47]

Motivation / Background

This Pull Request is created to add new locale data for Japanese football teams, players, coaches, competition names, and positions to this library.

Additional information

This change is based on existing English data, translated by contributors who are native Japanese speakers.

To ensure the accuracy and quality of the translation, it has been reviewed by multiple native speakers knowledgeable in soccer.

Checklist

Before submitting the PR make sure the following are checked:

• [x] This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• [x] Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• [x] Tests are added or updated if you fix a bug, refactor something, or add a feature.
• [x] Tests and Rubocop are passing before submitting your proposed changes.

If you're proposing a new generator or locale:

• [ ] Double-check the existing generators documentation to make sure the new generator you want to add doesn't already exist.
• [ ] You've reviewed and followed the Contributing guidelines.

[thdaraujo]

hi @yamat47, could you reformat lib/locales/ja/football.yml so I can merge this?

Thanks!

[yamat47]

@thdaraujo Thank you for the review.

I've added automated tests that pass locally but are failing on CI, and I'm looking into why. I used the same style as the rest of the project for RuboCop and am unclear why it's failing. Any specifics you could provide would be helpful.

Please let me know if you have any advice on how to proceed. Thank you!