/usr/share/gosa/plugins/personal/mail/sieve/templates/ is in gosa-plugin-mail 2.7.4+reloaded2-9ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gosa/plugins/personal/mail/sieve/templates/add_element.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/block_indent_start.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/block_indent_stop.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/create_script.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/edit_frame_base.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_address.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_allof.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_anyof.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_block_end.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_block_start.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_boolean.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_comment.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_discard.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_else.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_elsif.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_envelope.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_exists.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_fileinto.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_header.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_if.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_keep.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_redirect.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_reject.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_require.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_size.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_stop.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/element_vacation.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/import_script.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/management.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/object_container.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/object_container_clear.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/object_test_container.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/remove_script.tpl
/usr/share/gosa/plugins/personal/mail/sieve/templates/select_test_type.tpl