fix(shared): Ensure localizations fallback to english locale when key is undefined

[alexcarpenter]

Description

Fixes an issue where locales with undefined values for keys were not properly falling back to english values.

BEFORE	AFTER

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 5ae239e

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

This PR includes changesets to release 22 packages

Name	Type
@clerk/shared	Patch
@clerk/agent-toolkit	Patch
@clerk/astro	Patch
@clerk/backend	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-js	Patch
@clerk/elements	Patch
@clerk/expo-passkeys	Patch
@clerk/clerk-expo	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/clerk-react	Patch
@clerk/remix	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch
@clerk/themes	Patch
@clerk/types	Patch
@clerk/vue	Patch
@clerk/localizations	Patch

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Project	Deployment	Review	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Dec 17, 2025 8:10pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch alexcarpenter/fix-locale-fallback-2

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@clerk/vue

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commit: 5ae239e