wecr_restricted_content_message_global.php

<?php
/**
 * Allows you to override any custom message or the default message for users
 * 
 * @param string  $message      stock Easy Content Restriction message
 * @param int     $product_ids  The post_id array for the product the message would be tied to
 * @return string               Your custom message
 */
function  change_global_message( $message, $product_ids ) {
  return 'Our custom message';
} 
add_filter( 'wecr_restricted_content_message_global', 'change_global_message' );