localeIdentifier missing from flow type of I18nManager (#31589)
localeIdentifier missing from flow type of I18nManager (#31589)

Summary:
https://github.com/facebook/react-native/commit/23d9bf1a24f80003a8a3c0b82e9b5691e4e6544e looks like it accidently removed `localeIdentifier` from I18nManager.

## Changelog

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[General] [Fixed] - Re-added localeIdentifier to I18nManager constants

Pull Request resolved: https://github.com/facebook/react-native/pull/31589

Reviewed By: GijsWeterings

Differential Revision: D28690202

Pulled By: fkgozali

fbshipit-source-id: 543a491f89789bca5629e1251c94fd055ec4a801

javache/react-native,pandiaraj44/react-native,javache/react-native,facebook/react-native,javache/react-native,facebook/react-native,pandiaraj44/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,pandiaraj44/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,pandiaraj44/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,javache/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,pandiaraj44/react-native,javache/react-native