Option to provide non translated strings in a fallback locale

[thebigrick]

What/Why?

If a new string is added, the translation must be available in any language. If not, the dotted path notation will be displayed in its place. I introduced the capability of using a fallback language for the missing strings.

Testing

• Add a new string to the messages/en.json file
• Reference the string from any component
• Switch to a locale different from en
• The string should appear in English
• Add the string to the correct locale
• The string should appear in the correct locale

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: cc35708708301ea6053707c2cd91e18302835475

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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Name	Status	Preview	Updated (UTC)
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[deini]

Looks good, can we add a changeset please?

[thebigrick]

Looks good, can we add a changeset please?

I just provided one. I opted for a minor change rather than a patch since I do not consider the previous behavior a bug. Is this correct?