Remove old JS file and use the core version instead

aleksis/apps/alsijil/static/js/alsijil/person.js

-$(document).ready(function () {
-    $("#select_all_container").show();
-    $("#select_all_box").change(function (event) {
-        if ($(this).is(":checked")) {
-            $(document).find('input[name="selected_notes"]').prop({
-                indeterminate: false,
-                checked: true,
-            });
-        } else {
-            $(document).find('input[name="selected_notes"]').prop({
-                indeterminate: false,
-                checked: false,
-            });
-        }
-    });
-
-    $('input[name="selected_notes"]').change(function () {
-        var checked = $(this).is(":checked");
-        var indeterminate = false;
-        $(document).find('input[name="selected_notes"]').each(function () {
-            if ($(this).is(":checked") !== checked){
-                $("#select_all_box").prop({
-                    indeterminate: true,
-                })
-                indeterminate = true;
-                return false;
-            }
-        });
-        if (!(indeterminate)) {
-            $("#select_all_box").prop({
-                indeterminate: false,
-                checked: checked,
-            });
-        }
-    });
-});
\ No newline at end of file

aleksis/apps/alsijil/templates/alsijil/class_register/person.html

@@ -4,7 +4,7 @@
 
 {% block extra_head %}
   <link rel="stylesheet" href="{% static "css/alsijil/person.css" %}">
-  <script src="{% static "js/alsijil/person.js" %}" type="text/javascript"></script>
+  <script src="{% static "js/multi_select.js" %}" type="text/javascript"></script>
 {% endblock %}
 
 {% block browser_title %}{% blocktrans %}Class register: person{% endblocktrans %}{% endblock %}