chore(i18n): add missing Japanese translations

[morinokami]

I have added all missing Japanese translations. I confirmed that all keys are translated by running the pnpm i18n:check ja-JP command.

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Project	Deployment	Actions	Updated (UTC)
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Tracked Files

File	Note
lunaria/files/en-GB.json	Localization changed, will be marked as complete.
lunaria/files/en-US.json	Source changed, localizations will be marked as outdated.
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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📝 Walkthrough

Walkthrough

This pull request updates internationalisation locale files across English and Japanese languages. It applies a trailing period punctuation fix to the show_low_usage_tooltip text across English locale variants (en-GB and en-US). The Japanese locale files receive significant structural expansions, introducing new translation keys for keyboard shortcuts, data source configuration, security downgrades, trend visualisations, size formatting, and accessibility sections. The additions are purely additive without removing existing keys.

Possibly related PRs

• feat(i18n): update zh-TW translations #1314: Adds and expands the same set of i18n keys and structures including keyboard shortcuts, data source configuration, security downgrade handling, and accessibility sections.
• feat(i18n): update fr-FR translations #1232: Introduces the same new i18n key structures (shortcuts, data source, provenance, size formatting) across locale JSON files.
• feat(i18n): add missing zh-CN translations for shortcuts, data source… #1250: Adds identical localisation keys for keyboard shortcuts, data source settings, search entries, and trend-related content across multiple locale variants.

Suggested reviewers

• danielroe
• serhalp

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description directly relates to the changeset, which involves adding missing Japanese translations to locale files.

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✨ Finishing touches

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[github-actions]

Thanks for your first contribution, @morinokami! 🎊

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[morinokami]

This change is unrelated to the Japanese translations, but although both recent_versions_only_tooltip and show_low_usage_tooltip are sentences displayed inside a tooltip, only show_low_usage_tooltip was missing a comma, so I added one for consistency.