Angular localize/i18n since v14 release can't locate en-US locale even if it exists

[MitchellCash]

Which @angular/* package(s) are the source of the bug?

localize

Is this a regression?

Yes

Description

Running a simple Angular project with the localize package with a source locale of en-US and any number of translation languages throws a warning:

Locale data for 'en-US' cannot be found. Using locale data for 'en'.

This can even be seen in Angular's own example localized app found here https://angular.io/guide/i18n-example (StackBlitz: https://angular.io/generated/live-examples/i18n/stackblitz.html).

I forked this StackBlitz project and dropped all of the @angular/* packages back to v13 and the warning disappears so it looks like a clear regression.

Please provide a link to a minimal reproduction of the bug

Your own example: https://angular.io/generated/live-examples/i18n/stackblitz.html

Please provide the exception or error you saw

Locale data for 'en-US' cannot be found.  Using locale data for 'en'.

Please provide the environment you discovered this bug in (run ng version)

Angular CLI: 14.0.1
Node: 16.14.2
Package Manager: npm 7.17.0 
OS: linux x64

Angular: 14.0.1
... animations, cli, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1400.1
@angular-devkit/build-angular   14.0.1
@angular-devkit/core            14.0.1
@angular-devkit/schematics      14.0.1
@schematics/angular             14.0.1
rxjs                            7.5.5
typescript                      4.7.3

Anything else?

No response

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