It seems like these two helpers could be simplified quite a bit--

```javascript
$('#toggle-history-button').on('click', '.toggle-history-button', function(event) {
  event.preventDefault();
  $('#description-history-table').toggle();
  if ($(this).text() === 'Hide') {
    $(this).text('Show');
  } else {
    $(this).text('Hide');
  }
});
```

At least, I _think_ that works the same, and I _think_ it's clearer. Your call.