message: Changed back to NSString
diff: NSString *label;
  NSString *displayName;
  if (cColoredLabel.display_name != nil) {
  - displayName = [NSMutableString stringWithCString:cColoredLabel.display_name
  + displayName = [NSString stringWithCString:cColoredLabel.display_name
  encoding:NSUTF8StringEncoding];
  }
  if (cColoredLabel.label != nil) {
  - label = [NSMutableString stringWithCString:cColoredLabel.label
  + label = [NSString stringWithCString:cColoredLabel.label
  encoding:NSUTF8StringEncoding];
  }
  