code: function (sBrowserLanguage) {
  			if (!sBrowserLanguage || typeof sBrowserLanguage !== "string") {
  				return "";
  			}
  
  			var nIndex = sBrowserLanguage.indexOf("-");
  			if ((nIndex < 0) && (sBrowserLanguage.length <= 2)) {
  				return sBrowserLanguage.toUpperCase();
  			}
  			if (nIndex > 0 && nIndex <= 2) {
  				return sBrowserLanguage.substring(0, nIndex).toUpperCase();
  			}
  
  			return "";
  		}
docs: Converts the browser language into a 2-character ISO 639-1 language. If the browser language is in format RFC4646, the first part will be
  used: For example en-us will be converted to EN. If the browser language already is in ISO 639-1, it will be returned after an upper case
  conversion: For example de will be converted to DE.
  
  @param {String} sBrowserLanguage - Language in RFC4646
  @returns {String} Language in ISO 639-1. Empty string if conversion was not successful
  @public
  @function
  @name sap.ui.fl.Utils.convertBrowserLanguageToISO639_1