Add missing template

src/servala/core/templates/admin/core/controlplane/change_form.html

@@ -0,0 +1,12 @@
+{% extends "admin/change_form.html" %}
+{% load i18n admin_urls %}
+{% block submit_buttons_bottom %}
+    {{ block.super }}
+    {% if original %}
+        <div class="submit-row">
+            <input type="submit"
+                   value="{% translate 'Save and Test Connection' %}"
+                   name="_save_and_test" />
+        </div>
+    {% endif %}
+{% endblock %}