i18n(ja): update overrides.md and route-data.mdx

[morinokami]

Description

• Update overrides.md to match the English version.
  • Clarify how to override default components that use multiple slots. #2386
  • Astro 5 + collection loaders + legacy collections support #2612
  • Move route data to Astro.locals #2390
  • Add head content to route data #2927
• Updated route-data.mdx as well to match the content in overrides.md, and also cleaned up extra spaces and translation issues.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4c15c45

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[netlify]

✅ Deploy Preview for astro-starlight ready!

Name	Link
🔨 Latest commit	4c15c45
🔍 Latest deploy log	https://app.netlify.com/projects/astro-starlight/deploys/698b4bf8bd6b8c0007011d5a
😎 Deploy Preview	https://deploy-preview-3702--astro-starlight.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 100 (no change from production) Accessibility: 100 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[astrobot-houston]

Lunaria Status Overview

🌕 This pull request will trigger status changes.

Learn more

By default, every PR changing files present in the Lunaria configuration's files property will be considered and trigger status changes accordingly.

You can change this by adding one of the keywords present in the ignoreKeywords property in your Lunaria configuration file in the PR's title (ignoring all files) or by including a tracker directive in the merged commit's description.

Tracked Files

Locale	File	Note
ja	reference/overrides.md	Localization changed, will be marked as complete.
ja	reference/route-data.mdx	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.

[morinokami]

Hmm, it looks like #3696 and #3699 need to be merged first. I’ll switch this to draft for now.

[HiDeoo]

Thanks for the update 🌟

As expected, links validation is now working. I reviewed this PR using the Docs Translation Review Checklist as a non-native speaker and everything looks good to me 👍