navbar correctly highlights "frequency list"

Author: geoffrey-wu

client/frequency-list/subcategory.html

@@ -38,7 +38,7 @@
                         <a class="nav-link" href="/db">Database</a>
                     </li>
                     <li class="nav-item">
-                        <a class="nav-link" href="/frequency-list" aria-current="page">Frequency List</a>
+                        <a class="nav-link active" href="/frequency-list" aria-current="page">Frequency List</a>
                     </li>
                     <li class="nav-item">
                         <a class="nav-link" href="/geoword">Geoword</a>