misc: include agenda label in <title> element (#21287)

chrono/manager/templates/chrono/manager_agenda_view.html

@@ -1,6 +1,10 @@
 {% extends "chrono/manager_home.html" %}
 {% load i18n %}
 
+{% block page-title-extra-label %}
+- {% firstof agenda.label object.label %}
+{% endblock %}
+
 {% block appbar %}
 <h2>{{ object.label }}</h2>
 {% if user_can_manage %}

chrono/manager/templates/chrono/manager_base.html

@@ -12,6 +12,8 @@
 {% block page-title %}
   {% trans 'Agendas' as default_site_title %}
   {% firstof site_title default_site_title %}
+  {% block page-title-extra-label %}
+  {% endblock %}
 {% endblock %}
 {% block site-title %}
   {% trans 'Agendas' as default_site_title %}