bug903611: Fixed a href and changed it to button

Original Request from aali:
>>>We have a link in Popcorn maker to close or hide the message.
>>>We want to change from using <a href> to <button> or <span>

If you want all links in popcorn maker to use button instead of <a href="#"></a>. I found out that the following files have <a href="#"></a> however I will fix the mistake you highlighted in your comment for now.


> public/test/manual-tests/index.html
> public/test/manual-tests/index.html  
> public/test/manual-tests/index.html
> views/embed-shell.html
> views/embed.html