Release 2.3.0 (#4412)

- move user-preferences to edit submenu
- unify user preferences with other forms
- use light fieldset for all user-edit-forms
- support offcanvas elements
- allow to dynamically inject toolbar buttons (via plugins)
- use interface for formatting dates
- improve docker issue template
- bump version and composer packages

templates/base.html.twig

@@ -100,6 +100,10 @@
         {% if is_granted('view_own_timesheet') %}
             {% include 'partials/recent-activities.html.twig' %}
         {% endif %}
+        {% block navbar_extensions_after %}
+            {% set event = trigger(constant('App\\Event\\ThemeEvent::TOOLBAR')) %}
+            {{ event.content|raw }}
+        {% endblock %}
     {% endif %}
 {% endblock %}