i18n(eu): add Basque translations

[erral]

What does this PR do?

Add Basque translation

Closes #

Type of change

• Bug fix
• Feature (requires maintainer-approved Discussion)
• Refactor (no behavior change)
• Translation
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation and pnpm locale:extract has been run (if applicable)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code

Screenshots / test output

[changeset-bot]

🦋 Changeset detected

Latest commit: 0dfd34f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@emdash-cms/admin	Minor
emdash	Minor
@emdash-cms/cloudflare	Minor
@emdash-cms/auth	Minor
@emdash-cms/blocks	Minor
@emdash-cms/gutenberg-to-portable-text	Minor
@emdash-cms/x402	Minor
create-emdash	Minor
@emdash-cms/plugin-embeds	Patch

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[github-actions]

Scope check

This PR changes 765 lines across 5 files. Large PRs are harder to review and more likely to be closed without review.

If this scope is intentional, no action needed. A maintainer will review it. If not, please consider splitting this into smaller PRs.

See CONTRIBUTING.md for contribution guidelines.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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I have read the CLA Document and I hereby sign the CLA

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commit: 0dfd34f