Bugfix/live 8014 llm custom button

[qperrot]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • ...

📝 Description

Modified common.json to add "addCustomValidator": "+ Add custom validator" so it will be translated.

❓ Context

• JIRA or GitHub link: LIVE-8014

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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5 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
ledger-live-docs	⬜️ Ignored (Inspect)			Oct 7, 2024 11:56am
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react-ui-storybook	⬜️ Ignored (Inspect)	Visit Preview		Oct 7, 2024 11:56am
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