Changes the View cart input to '+'. Event Espresso 4 + Multi Event Registration add-on.

my_ee_change_view_cart.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_action( 'wp_enqueue_scripts', 'my_ee_disable_view_cart', 11 );
function my_ee_disable_view_cart() {
  wp_add_inline_script( 
    'espresso_multi_event_registration',
    'function changeViewCart(){
      jQuery("input[value=\'View Event Cart\']").val("+");
    }
    jQuery(document).ready(changeViewCart);
    jQuery(document).ajaxComplete(changeViewCart);'
  );
}