src/cm/media/js/lib/yui/yui3-3.15.0/build/datatable-message/lang/datatable-message.js
add some more custom config and put every thing in comment in the custom.yaml template
YUI.add("lang/datatable-message",function(e){e.Intl.add("datatable-message","",{emptyMessage:"No data to display",loadingMessage:"Loading..."})},"@VERSION@");