remove Schedule.end property + fix templates + add accessibility info

aircox_cms/templates/aircox_cms/program_page.html

@@ -12,18 +12,25 @@
     <h2>{% trans "Schedule" %}</h2>
     <ul>
         {% for schedule in page.program.schedule_set.all %}
-        <li>
-            {% with frequency=schedule.get_frequency_display day=schedule.date|date:'l' %}
-            {% with start=schedule.date|date:"H:i" end=schedule.end|date:"H:i" %}
+        {% with frequency=schedule.get_frequency_display day=schedule.date|date:'l' %}
+
+        {% with start_hour=schedule.time.hour start_minute=schedule.time.minute %}
+        {% with duration_hour=schedule.duration.hour duration_minute=schedule.duration.minute %}
+        <li aria-label="{% blocktrans trimmed %}Diffusion on {{ day }} at {{ start_hour }} hours {{ start_minute }}, on the {{ frequency }}, and last for {{ duration_hour }} hours and {{ duration_minute }} minutes {% endblocktrans %}">
+        {% endwith %}
+        {% endwith %}
+
+        {% with start=schedule.time|date:"H:i" duration=schedule.duration|time:"H\"i" %}
             {% blocktrans trimmed %}
-            {{ day }} at {{ start }} until {{ end }}, <span class="info">{{ frequency }}</span>
+            {{ day }} at {{ start }} ({{ duration }}),  <span class="info">{{ frequency }}</span>
             {% endblocktrans %}
-            {% endwith %}
-            {% endwith %}
             {% if schedule.initial %}
             <span class="info">{% trans "Rerun" %}</span>
             {% endif %}
+        {% endwith %}
+
         </li>
+        {% endwith %}
         {% endfor %}
     </ul>
 {% else %}