Add support for string plurals

[RussellZornes]

A way to deal with string plurals would be useful.

{
  "clicked": {
    "zero": "You didn't click",
    "one": "You clicked one time!",
    "other": "You clicked many times!"
  }
}

In code the strings would be accessed as...

Translation.of(context).clicked(times);

Where 'times' is an integer that would be used to map to plural entry.

[narcodico]

This feature is a must to be honest.

[csbence10]

We've just started developing this feature. It will work similarly as @RussellZornes requested. We also plan to support languages with multiple plurals. Stay tuned 📻