aria-hidden tags for email obfuscation tags

.. assuming spammers don't use screen readers?

Author: stain

src/main/resources/templates/about.html

@@ -138,11 +138,11 @@ <h2>Data controller</h2>
             <a href="https://view.commonwl.org/">https://view.commonwl.org/</a> instance of CWL Viewer 
             is The University of Manchester, contact             
             <a href="javascript:window.location.href=atob('bWFpbHRvOmluZm9AZXNjaWVuY2VsYWIub3JnLnVr')">
-            <code><span class="obf-hide">NOT</span>info<span class="obf-at"></span><span class="obf-hide">()</span><span class="obf-hide">NONE</span>esciencelab.org.uk</code></a> for any enquiries.
+            <code><span class="obf-hide" aria-hidden="true">NOT</span>info<span class="obf-at"></span><span class="obf-hide" aria-hidden="true">()</span><span class="obf-hide" aria-hidden="true">NONE</span>esciencelab.org.uk</code></a> for any enquiries.
             If this viewer is accessed at a different URL, the data controller is likely someone else.
             </p>
             <p>            
-            <span class="obf-hide">(sorry non-css-non-JS folks, manual de-obfuscation needed above)</span>
+            <span class="obf-hide" aria-hidden="true">(manual de-obfuscation needed above)</span>
             You may contact the Data Controller to request access to data about yourself, 
             or to request update or removal of your personally identifiable information.
             You may also want to follow the <em>Shown Workflow</em> link at the bottom