Improve teams page on mobile and correcting populate.py

CTFd/templates/team.html

@@ -34,14 +34,18 @@
         <thead>
             <tr>
                 <td><b>Challenge</b></td>
-                <td><b>Category</b></td>
+                <td class="hidden-xs"><b>Category</b></td>
                 <td><b>Value</b></td>
                 <td><b>Time</b></td>
             </tr>
         </thead>
         <tbody>
         {% for solve in solves %}
-            <tr><td><a href="/challenges#{{ solve.chal.name }}">{{ solve.chal.name }}</a></td><td>{{ solve.chal.category }}</td><td>{{ solve.chal.value }}</td><td class="solve-time"><script>document.write( moment({{ solve.date|unix_time_millis }}).local().format('MMMM Do, h:mm:ss A'))</script></td></tr>
+            <tr>
+                <td><a href="/challenges#{{ solve.chal.name }}">{{ solve.chal.name }}</a></td>
+                <td class="hidden-xs">{{ solve.chal.category }}</td><td>{{ solve.chal.value }}</td>
+                <td class="solve-time"><script>document.write( moment({{ solve.date|unix_time_millis }}).local().format('MMMM Do, h:mm:ss A'))</script></td>
+            </tr>
         {% endfor %}
         </tbody>
     </table>