TranslatePress: use [data-src] data for the images translation

<?php

// Use [data-src] data instead of [src] to correctly handle the laza images
add_filter( 'trp_node_accessors', 'trpc_exclude_images_and_links' );
function trpc_exclude_images_and_links( $args ) {
  $args['image_src']['selector'] = 'img[data-src]'; // original selector is 'img[src]'
  $args['image_src']['accessor'] = 'data-src'; // original is accessor is 'src'

  return $args;
}