css: ensure dtext is always wrapped in .prose container.

Ensure dtext is always wrapped in a `<div class="prose">` or
`<span class="prose">` (for inline dtext) container so that dtext css is
properly applied.

app/views/user_feedbacks/index.html.erb

@@ -19,7 +19,9 @@
             <td><%= link_to_user feedback.creator %></td>
             <td><%= compact_time(feedback.created_at) %></td>
             <td>
-              <%= format_text(feedback.body) %>
+              <div class="prose">
+                <%= format_text(feedback.body) %>
+              </div>
               <%= render "application/update_notice", record: feedback, interval: 0.minutes %>
             </td>
             <td>

app/views/user_feedbacks/show.html.erb

@@ -6,7 +6,12 @@
       <li><strong>Creator</strong> <%= link_to_user @user_feedback.creator %></li>
       <li><strong>Date</strong> <%= @user_feedback.created_at %></li>
       <li><strong>Category</strong> <%= @user_feedback.category %></li>
-      <li><strong>Message</strong> <%= format_text @user_feedback.body %></li>
+      <li>
+        <strong>Message</strong>
+        <div class="prose">
+          <%= format_text @user_feedback.body %>
+        </div>
+      </li>
     </ul>
 
     <% if @user_feedback.editable_by?(CurrentUser.user) %>