The following optional topics help you manually configure the internationalization settings of your application. The optional practices are meant for advanced or custom Angular applications.
To prepare your project for translations, you should have a basic understanding of the following subjects.
Learn how to change the runtime locale for your project
Import global variants of the locale dataLearn how to import locale data for language variants
Manage marked text with custom IDsLearn how to implement custom IDs to help you manage your marked text
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https://v12.angular.io/guide/i18n-optional-overview