polish(roster): state <48h turnaround reg

Make it more obvious to students that if their registration hasn't been
approved for a while, then something is wrong.

dashboard/templates/dashboard/stulist.html

@@ -69,6 +69,10 @@
         so you'll need to wait for Evan to confirm your registration.
         Contact me if you think this is an error.
       </p>
+      <p>
+        Also contact Evan if it has been more than 48 hours
+        and your registration hasn't been processed yet.
+      </p>
     {% elif exists_registration %}
       <p>
         To register for this year,

roster/templates/roster/decision_form.html

@@ -24,7 +24,14 @@ <h1>Please fill the following in...</h1>
     {% include "generic_form.html" with submit_name="Register" %}
   {% else %}
     <p>
-      <a href="{% url "top" %}">Go back</a>
+      <strong>You have submitted a decision form for this year.</strong>
+      No action is needed from you.
+    </p>
+    <p>
+      If it has been more than 48 hours and you still do not have access
+      to the portal for this year from the
+      <a href="{% url "top" %}">index page</a>,
+      please contact Evan to see what's going on.
     </p>
   {% endif %}
 {% endblock layout-content %}