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.

[sam-gc]

Hi, thanks for this feature request. Adding new languages is not currently on our roadmap, but we will keep this issue open to gauge interest in the community.

[landsman]

@sam-gc Please. This is a core feature to use this package regularly 😢
Thanks this I have to write my own solution over SDK, which is such wasting of time...

firebase/firebaseui-web-react#21 (comment)