The web content instructions are not translated, the code fragment is commented in PortletIFrame class

/* TODO: Make this work
if (locale != null){
// check if localized file exists for current language/locale/variant
String localizedFile = doc + "_" + locale.toString() + ext;
String filePath = getServletConfig().getServletContext().getRealPath( ".."+localizedFile );
if ( (new File(filePath)).exists() )
return localizedFile;

// otherwise, check if localized file exists for current language
localizedFile = doc + "_" + locale.getLanguage() + ext;
filePath = getServletConfig().getServletContext().getRealPath( ".."+localizedFile );
if ( (new File(filePath)).exists() )
return localizedFile;
}
*/