Fix display of ToS/publication error

Signed-off-by: Chris Warrick <kwpolska@gmail.com>

templates/add-error.html

@@ -1,22 +1,16 @@
 {% extends "base.html" %}
 {% block content %}
 <p class="text-danger lead">Something went wrong.</p>
-{% if reason == 'tos' %}
+{% if reason == 'tos_pub' %}
 <p class="text-danger">You need to accept the Terms of Service and acknowledge data publication.</p>
 {% elif reason == 'duplicate' %}
 <p class="text-danger">There is an entry for this page already — you should <a href="/edit/">request an edit</a>.</p>
 {% else %}
-<p class="text-danger">Possible causes include:</p>
-
-<ul>
-    <li><p class="text-danger">This page already exists in our database (and you
-        should <a href="/edit/">request an edit</a>)</p></li>
-    <li><p class="text-danger">Some fields were empty</p></li>
-    <li><p class="text-danger">Some fields were too long</p></li>
-    <li><p class="text-danger">Some fields were missing</p></li>
-</ul>
-<p>Error list:</p>
+<p class="text-danger">The following errors occurred:</p>
+<div class="text-danger">
 {{ reason }}
+</div>
+
 {% endif %}
 
 <p>Please press the Back button and fix those problems.</p>