Change term in navi

_includes/header.html

@@ -20,7 +20,7 @@
           <a class="page-link" href="#start">Let's Get Started</a>
           <a class="page-link" href="#course">About The Course</a>
           <a class="page-link" href="#about">About Us</a>
-          <a class="page-link" href="#downloads">Materials</a>
+          <a class="page-link" href="#downloads">Resources</a>
         </div>
       </nav>
     </div>

backlog/20171030_home.html

@@ -116,7 +116,7 @@ layout: default
     <hr>
 
     <article id="downloads">
-    <h1>Additional Material</h1>
+    <h1>Additional Resources</h1>
 
     <h2>Booklet</h2>
     <p>Here you can download the free and open booklet "Ethics and Technology: Some Issues". It holds the chapters from the course and offers some additional links.</p>