/usr/share/horde/mnemo/templates/ is in php-horde-mnemo 4.2.12-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/horde/mnemo/templates/.htaccess
/usr/share/horde/mnemo/templates/data/
/usr/share/horde/mnemo/templates/data/export.inc
/usr/share/horde/mnemo/templates/data/import.inc
/usr/share/horde/mnemo/templates/list/
/usr/share/horde/mnemo/templates/list/_summary.html.php
/usr/share/horde/mnemo/templates/list/empty.html.php
/usr/share/horde/mnemo/templates/list/header.html.php
/usr/share/horde/mnemo/templates/list/memo_footers.html.php
/usr/share/horde/mnemo/templates/list/memo_headers.html.php
/usr/share/horde/mnemo/templates/memo/
/usr/share/horde/mnemo/templates/memo/memo.html.php
/usr/share/horde/mnemo/templates/view/
/usr/share/horde/mnemo/templates/view/view.html.php