v2.2.0

• Add a trans option for specifying extensions and fallbackKey:

{
    trans: {
        extensions: ['.js', '.jsx'],
        fallbackKey: false // Defaults to false
    }
}

Available options for fallbackKey:

• Pass true to return the content as key.
• Specify a function to return user-defined key:

  // @param {string} ns The namespace currently used.
  // @param {string} value The value.
  // @return {string} Returns a translation key for the given value.
  fallbackKey: function(ns, value) {
      return value;
  }