Alan Agius d55fc62ef2 fix(@angular-devkit/build-angular): fallback to use language ID to set the dir attribute
In some cases we don't ship certain locales, or they map to files which are named only the language IDs. Example `en-US`, which it's locale data is available from `@angular/common/locales/en.mjs`

Closes #22285
2021-12-06 14:50:26 +00:00
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