feat(clerk-js,localizations,types): Add sign in or up subtitle localizations

[alexcarpenter]

Description

Adds optional localization to sign-in-or-up flow to render a subtitle if needed.

Default	With subtitle

We always render the subtitle in the dom and hide with CSS when undefined to help with localization key discoverability.

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: 1f2efb6

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

This PR includes changesets to release 22 packages

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

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Name	Status	Preview	Comments	Updated (UTC)
clerk-js-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 23, 2025 8:07pm

[alexcarpenter]

By default the sign in start subtitle is undefined, and we use the empty selector to ensure the element does not take up any space within the dom. This is to enable folks to see that there is a localization option available for subtitle when viewing source in the dom. Then they can add the localization and it will show for them.