Update admin markup

Author: fsbraun

djangocms_versioning/cms_config.py

@@ -345,7 +345,7 @@ class VersioningCMSConfig(CMSAppConfig):
             grouper_field_name="page",
             extra_grouping_fields=["language"],
             version_list_filter_lookups={
-                "language": lambda request, _: get_language_tuple(site_id=get_current_site(request).pk)
+                "language": lambda *args: get_language_tuple(site_id=get_current_site(args[0]).pk)
             },
             copy_function=copy_page_content,
             grouper_selector_option_label=label_from_instance,

djangocms_versioning/templates/djangocms_versioning/admin/discard_confirmation.html

@@ -17,12 +17,12 @@ <h3>{{ object_name }}</h3>
 <h4>{% blocktrans %}Version number: {{ version_number }}{% endblocktrans %}</h4>
 <form action="" method="POST">
     {% csrf_token %}
-    <div class="submit-row">
+    <div>
         <input  class="button confirm-link js-versioning-keep-sideframe default"
                 type="submit"
                 name="discard"
                 value="{% translate "Yes, I'm sure" %}">
-        <a href="{{ back_url }}" class="cancel-link js-versioning-keep-sideframe" role="button">
+        <a href="{{ back_url }}" class="button cancel-link js-versioning-keep-sideframe" role="button">
             {% translate 'No, take me back' %}
         </a>
     </div>

djangocms_versioning/templates/djangocms_versioning/admin/grouper_form.html

@@ -41,7 +41,9 @@
             </div>
           </div>
         </fieldset>
-        <button type="submit">{% translate "Submit" %}</button>
+        <div class="submit-row">
+          <input type="submit" value="{% translate "Submit" %}" class="default"/>
+        </div>
         </form>
       </form>
     </div>