@mhevery @vsavkin Review?

i18n plural pipe

Maps a value to a string that pluralizes the value properly.

Usage

expression | i18nPlural:mapping

where expression is a number and mapping is an object that indicates the proper text for
when the expression evaluates to 0, 1, or some other number. You can interpolate the actual
value into the text using the # sign.

Example

  <div [title]="messages.length | i18nPlural: messageMapping">
  </div>

  class MyApp {
    messages: any[];
    messageMapping: any = {
      '=0': 'No messages.',
      '=1': 'One message.',
      'other': '# messages.'
    }
    ...
  }

i18n select pipe

Generic selector that displays the string that matches the current value.

Usage

expression | i18nSelect:mapping

where mapping is an object that indicates the text that should be displayed for different values of the provided expression.

Example

  <div [title]="gender | i18nSelect: inviteMap">
  </div>

  class MyApp {
    gender: string = 'male';
    inviteMap: any = {
      'male': 'Invite her.',
      'female': 'Invite him.',
      'other': 'Invite them.'
    }
    ...
  }