Preserve linebreaks in messages.html

Signed-off-by: Matthias Stevens <[email protected]>

geokey/templates/snippets/messages.html

@@ -8,7 +8,7 @@
             {% for message in messages %}
             <div class="alert alert-{{ message.tags }} alert-dismissible" role="alert">
                 <button type="button" class="close" data-dismiss="alert"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-                {{ message }}
+                {{message|linebreaks}}
             </div>
             {% endfor %}
 {% endif %}