feat(localizations,shared,ui): Change invite members CTA based on available seats

[dstaley]

Description

This PR updates the "Send invitations" button text to "Purchase additional seats" when the organization is on a per-seat cost plan and is attempting to invite more members than their current subscription item entitles them to.

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:

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 26, 2026 5:07pm

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Latest commit: 7367571

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