Change behavior of "Get PEM" button

[chmc3]

A customer is requesting that we change the way the text presentation of the .pem certificate is changed from it's current state.
Currently the page uses a deprecate <tt> element. The suggestion is to replace the <tt> element with the following:
<div contenteditable="true" oncut="return false;" onpaste="return false" onkeydown="if(event.metaKey || event.ctrlKey) return true; return false;" style="font-size: 95%;">

[chmc3]

This was requested by a customer in REQ7749654

[stea-uw]

While I appreciate the snippet they gave, I think the recommended fix for this element is to use <pre><code>.