Revert "Do not use save-button from core."

This reverts commit e92cdccd

aleksis/apps/schild_nrw/templates/schild_nrw/schild_import.html

@@ -43,8 +43,6 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% form form=upload_form %}{% endform %}
-    <button type="submit" class="btn waves-effect waves-light green">
-     <i class="material-icons left">cloud_upload</i> {% trans "Import" %}
-    </button>
+    {% include "core/save_button.html" %}
   </form>
 {% endblock %}