[Cleanup] Clean up the xmpp remainder (#4286)

* [Web] Update russian translation (lang.ru.json)

* XMPP cleanup

Co-authored-by: Dmitriy Alekseev <1865999+dragoangel@users.noreply.github.com>

data/Dockerfiles/phpfpm/docker-entrypoint.sh

@@ -186,9 +186,6 @@ chown -R 82:82 /web/templates/cache
 # Clear cache
 find /web/templates/cache/* -not -name '.gitkeep' -delete
 
-[[ ! -f /etc/nginx/conf.d/ZZZ-ejabberd.conf ]] && echo '# Autogenerated by mailcow' > /etc/nginx/conf.d/ZZZ-ejabberd.conf
-chown 82:82 /etc/nginx/conf.d/ZZZ-ejabberd.conf
-
 # Run hooks
 for file in /hooks/*; do
   if [ -x "${file}" ]; then