changed sustainability back to check

wiki/menu.html

@@ -52,7 +52,7 @@
           </a>
           <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
             <li><a class="dropdown-item" href="{{ url_for('pages', page='human-practices') }}">Human Practices</a></li>
-            <li><a class="dropdown-item" href="{{ url_for('pages', page='sustainable') }}">Sustainability</a></li>
+            <li><a class="dropdown-item" href="{{ url_for('pages', page='sustainability') }}">Sustainability</a></li>
             <li><a class="dropdown-item" href="{{ url_for('pages', page='integrated-human-practices') }}">Integrated Human Practices</a></li>
             <li><a class="dropdown-item" href="{{ url_for('pages', page='entrepreneurship') }}">Entrepreneurship and Implementation</a></li>
             <li><a class="dropdown-item" href="{{ url_for('pages', page='education') }}">Education</a></li>