Bugfixes for Kimai 1.4.1 (#1158)

* fix missing translation for preset datatable headers
* better dependency check for avatar service
* show only own teams to teamleads

templates/macros/datatables.html.twig

@@ -13,9 +13,10 @@
                         {% if not headerOptions is iterable %}
                             {% set headerOptions = {'class': headerOptions} %}
                         {% endif %}
-                        {% set headerTitle = ('label.' ~ title)|trans %}
                         {% if headerOptions.title is defined %}
                             {% set headerTitle = headerOptions.title %}
+                        {% else %}
+                            {% set headerTitle = ('label.' ~ title)|trans %}
                         {% endif %}
                         {% if 'alwaysVisible' not in headerOptions.class %}
                             <div class="form-group">