fix(i18n): update Japanese translation

[shuuji3]

Sorry, this is the second update today:

• Add three new strings
• Update the tagline that I forgot in the previous PR

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Feb 7, 2026 4:09pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ignored	Preview	Feb 7, 2026 4:09pm
npmx-lunaria	Ignored		Feb 7, 2026 4:09pm

[github-actions]

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Tracked Files

File	Note
lunaria/files/ja-JP.json	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request updates the Japanese locale translation file with four key changes: the SEO home page description now emphasises "fast and modern" by prepending "高速で" to the existing text; the site tagline is updated to "高速でモダンなnpmレジストリブラウザ"; a new translation entry copy_as_markdown is added for readme functionality; and a new facet item totalLikes with corresponding label and description is introduced.

Possibly related PRs

• fix: use latest tag line "better" -> "fast, modern" #1029: Updates site tagline and SEO description from "better" to "fast, modern" terminology across English locale strings and related templates.
• docs(i18n): update zh-CN translation #1131: Adds the package.readme.copy_as_markdown translation key across multiple locale files, including the same field modified in this PR.
• fix(i18n): update Japanese translations #862: Modifies the same Japanese localisation file sections, including updates to tagline, SEO description, readme translations, and facet items.

Suggested reviewers

• danielroe

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description is related to the changeset, mentioning the addition of three new strings and updating the tagline, which aligns with the file modifications shown.

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✨ Finishing touches

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• Create PR with unit tests
• Post copyable unit tests in a comment

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[Copilot]

Pull request overview

Updates the Japanese locale strings to match recent UI/content changes, keeping both translation bundles in sync.

Changes:

• Updated the home SEO description and global tagline to include “高速でモダンな…”.
• Added a new README action string (copy_as_markdown).
• Added a new comparison metric label/description (totalLikes).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
lunaria/files/ja-JP.json	Updates Japanese strings (tagline/SEO + new README copy action + new compare metric).
i18n/locales/ja-JP.json	Mirrors the same Japanese translation updates for the main i18n locale bundle.

[serhalp]

I trust you 😁

[shuuji3]

Thank you! 😄