Fix time format

shiftregister/app/templates/helper_base.html

@@ -11,7 +11,7 @@
     <p class="navbar-item has-text-danger">Bestätige deine Telefonnummer über den Link in der SMS</p>
 {% endif %}
 {% if helper.important_shift %}
-    <a class="navbar-item" href="{% url 'shift' helper.important_shift.pk %}">{%if helper.important_shift.is_running%}Laufende{% else %}Nächste{% endif %} Schicht ({{ helper.important_shift.start_at|date:"H:m" }})</a>
+    <a class="navbar-item" href="{% url 'shift' helper.important_shift.pk %}">{%if helper.important_shift.is_running%}Laufende{% else %}Nächste{% endif %} Schicht ({{ helper.important_shift.start_at|date:"H:i" }})</a>
 {% endif %}
 {% endif %}
 </div>