code: function(error, substitutions) {
  		var text = error.text;
  		if (substitutions) {
  		  var field,start;
  		  for (var i=0; i<substitutions.length; i++) {
  			field = "{"+i+"}";
  			start = text.indexOf(field);
  			if(start > 0) {
  				var part1 = text.substring(0,start);
  				var part2 = text.substring(start+field.length);
  				text = part1+substitutions[i]+part2;
  			}
  		  }
  		}
  		return text;
  	}
docs: Format an error message text.
  @private
  @param {error} ERROR.KEY value above.
  @param {substitutions} [array] substituted into the text.
  @return the text with the substitutions made.