code: private String determineLanguageUrl(FacesContext fc, String lang) {
  		// Build resource url
  		return fc.getApplication().getResourceHandler()
  				.createResource("jq/ui/i18n/dt/datatable-" + lang + ".json", C.BSF_LIBRARY).getRequestPath();
  	}
docs: Determine the locale to set-up to dataTable component. The locale is
  determined in this order: - if customLangUrl is specified, it is the value
  set up - otherwise, the system check if locale is explicit specified -
  otherwise it takes from the ViewRoot
  
  @param fc
  @param dataTable
  @return