Change the lable for the letter field in Salsa actions

action_change_letter_label.html

<script type="text/javascript"> 
  // See https://help.salsalabs.com/entries/22876904-Hide-email-addresses-on-targeted-actions
  $(document).ready(function() {
    if (RegExp('action_KEY=NNNNN').test(window.location.href)) { 
      var checkExist = null; 
      var recipientChecker = function() { 
        if ($('.recipient').length) { 
          clearInterval(checkExist); 
          $('label[for^=Content]').text("YOUR REPLACEMENT HERE");
        } 
      } 
      checkExist = setInterval(recipientChecker, 1000); 
    }
}); 
</script>