We need to use page body event delegation so it will work with any
element even with the ones added through ajax, in this case the
annotation comments box form. By doing this way we do not need
this code on the server response anymore.
Furthermore JS events defined at ajax responses are not part of
application javascript and are lost when restoring a page from
browser cache, you can try to apply the same event delegation
technique to the `erb` file and it wont work just because events
added dinamically are not treated the same than `application.js`
code.
To reproduce the error:
1. Load an annotatable draft version
2. Move to any other page
3. Go back
Now "Publish comment" button wont work.
