[FIX] Use proper HTML5 tags instead of self-closing XML/XHTML tags

allianceauth/timerboard/templates/timerboard/form.html

@@ -19,7 +19,7 @@
                     <form id="add-timer-form" class="form-signin" role="form" action="" method="POST">
                         {% csrf_token %}
                         {{ form|bootstrap }}
-                        <br/>
+                        <br>
                         <button class="btn btn-lg btn-primary btn-block" type="submit">
                             {% block submit_button_text %}
                             {% endblock %}

allianceauth/timerboard/templates/timerboard/timer_confirm_delete.html

@@ -17,7 +17,7 @@
                     <form action="" method="post">
                         {% csrf_token %}
                         <p>{% blocktrans %}Are you sure you want to delete timer "{{ object }}"?{% endblocktrans %}</p>
-                        <input class="btn btn-danger btn-block" type="submit" value="Confirm" />
+                        <input class="btn btn-danger btn-block" type="submit" value="Confirm">
                     </form>
                 </div>
             </div>