Display the formatted message for incident's updates.

In order to be backward compatible, the formatted message is displayed
for incident's updates, so a strong sentance can be used as it was the
case before.

resources/assets/sass/status-page/_status-page.scss

@@ -423,4 +423,8 @@ body.status-page {
             }
         }
     }
+    //Display inline the incident update message.
+    .incident-update-item > p {
+        display: inline-block;
+    }
 }