docs(angular): add multiple locales content (#6901)

src/data/roadmaps/angular/content/multiple-locales@9ISvaaJ815_cr_KW9vQhT.md

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 # Multiple Locales
+
+To deploy an Angular application with multiple locales, follow these steps:
+
+1. Place different versions of your app in locale-specific directories
+2. Use the HTML `<base>` tag with the `href` attribute to set the base URL for relative links.
+3. Deploy each language version in a different subdirectory. Redirect users to their preferred language based on the `Accept-Language` HTTP header.
+
+Visit the following resources to learn more:
+
+- [@official@Angular Official Docs - Deploy Multiple Locales](https://angular.dev/guide/i18n/deploy)
+- [@video@How Make Multi-Language Angular Websites - Full Guidance On Angular Localization](https://www.youtube.com/watch?v=vSwYuyH4kMA)