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add_filter( 'woo_breadcrumbs_trail', 'woo_custom_filter_breadcrumbs_trail', 10 );
 
function woo_custom_filter_breadcrumbs_trail ( $trail ) {
foreach ( $trail as $k => $v ) {
  if ( strtolower( strip_tags( $v ) ) == 'portfolio' ) {
	$trail[$k] = 'Gallery';
	break;
	}
}
return $trail;
} // End woo_custom_filter_breadcrumbs_trail()