feat(core): provide a fallback locale for translations

[chanceaclark]

What/Why?

CI run for #1659

Testing

See CI

[vercel[bot]]

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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](https://vercel.com/bigcommerce-platform/catalyst/GJ7tse5VtwmDQjd8PVTQ1GA9xcrM)) | | | Nov 21, 2024 5:38pm | | **catalyst-au** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-au/8UK2GL6ekpd1xiHayshtbhAeBAqg)) | | | Nov 21, 2024 5:38pm | | **catalyst-soul** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-soul/2vRgSw1mawbMbCLj9Zf4PjeVgB1B)) | | | Nov 21, 2024 5:38pm | | **catalyst-uk** | ⬜️ Ignored ([Inspect](https://vercel.com/bigcommerce-platform/catalyst-uk/9NFvoNEZZGSQjChGckoUSSzakCpf)) | | | Nov 21, 2024 5:38pm |

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f4a94b5005e60d02a5719ca590e50b0248a47837

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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[github-actions[bot]]

⚡️🏠 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