Add Support for additional languages

[davidyoung77]

Is your feature request related to a problem? Please describe. These languages are not supported by the library, see official list https://github.com/firebase/firebaseui-web/blob/master/LANGUAGES.md

{
    “zh”: “中文(简)“,
    “yi”: “יידיש“,
    “bn”: “বাঙালি“,
    “ht”: “Kreyòl ayisyen”,
    “ur”: “اردو“,
  }

Describe the solution you'd like Add support for the missing languages

Describe alternatives you've considered Using another library https://github.com/AnthonyNahas/ngx-auth-firebaseui And adding support for the login with phone functionality

I have need for sign in with phone and email and these language types

Additional context Add any other context or screenshots about the feature request here.