feat(core): provide a fallback locale for translations

[chanceaclark]

What/Why?

CI run for #1659

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
catalyst-latest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 21, 2024 5:38pm

4 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
catalyst	⬜️ Ignored (Inspect)			Nov 21, 2024 5:38pm
catalyst-au	⬜️ Ignored (Inspect)			Nov 21, 2024 5:38pm
catalyst-soul	⬜️ Ignored (Inspect)			Nov 21, 2024 5:38pm
catalyst-uk	⬜️ Ignored (Inspect)			Nov 21, 2024 5:38pm

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🦋 Changeset detected

Latest commit: f4a94b5

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

This PR includes changesets to release 1 package

Name	Type
@bigcommerce/catalyst-core	Minor

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⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-qm7tbm8jf-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟠 Performance	85
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟢 Performance	90
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	85