code: function(language){
      var browserLocale = navigator.language || navigator.userLanguage || navigator.browserLanguage;
      this.options.language = language || this.options.language || browserLocale;
      return this;
    }
docs: Get the language to use in UI elements and when making search requests
  
  Look first at the explicitly set options otherwise use the browser's language settings
  @param {String} language Specify the language to use for response text and query result weighting. Options are IETF language tags comprised of a mandatory ISO 639-1 language code and optionally one or more IETF subtags for country or script. More than one value can also be specified, separated by commas.
  @returns {MapboxGeocoder} this