Refactor bulk delete error handling and update user search visibility for superusers

templates/question_table_view.html

@@ -10,6 +10,7 @@
             <div class="d-flex justify-content-between mb-2 align-items-center flex-column flex-md-row">
                 <div class="mb-2 mb-md-0">
                     <div class="btn-toolbar" role="toolbar">
+                        {% if user.is_superuser %}
                         <div class="btn-group me-2" role="group">
                             <button id="delete-selected-btn" class="btn btn-danger btn-sm"
                                     hx-post="{% url 'generic:bulk_delete_questions' %}"
@@ -19,6 +20,7 @@
                                     hx-swap="innerHTML"
                                     hx-confirm="Are you sure you want to delete the selected questions? This action cannot be undone.">Delete selected</button>
                         </div>
+                        {% endif %}
                         <div class="btn-group" role="group">
                             <button id="button-select-add-exam" class="btn btn-outline-primary btn-sm"
                                     hx-get="{% url 'generic:generic_exam_htmx' %}?type={{ app_name }}"