Fix undefined $conf, #6406

Closes #6406

See merge request ispconfig/ispconfig3!1655

Fixed Wrong DNS Validation #6357

See merge request ispconfig/ispconfig3!1616

Added validator for listname Fix #6362

Closes #6362

See merge request ispconfig/ispconfig3!1617

Collected minor correction/ translation fixes

See merge request !1646

Add content name to page title for edit forms, #6401

Closes #6401

See merge request !1648

Merge branch '6313-add-warning-to-update-script-when-incorrect-php-version-is-used-as-default' into 'develop'

Resolve "Add warning to update script when incorrect PHP version is used as default"

Closes #6313

See merge request !1647

Resolve "PHP warnings in Installer on PHP 8.1"

Closes #6398

See merge request !1643

Fix apps vhost tpl symlink

See merge request !1642

Source /etc/profile from cron.sh

See merge request !1640

Resolve "apps vhost template file error in dev"

Closes #6397

See merge request !1641

Resolve "Support PHP 8.X"

Closes #6328

See merge request !1602

Merge branch '6328-support-php-8-x' of git.ispconfig.org:ispconfig/ispconfig3 into 6328-support-php-8-x

# Conflicts:
#   server/lib/classes/letsencrypt.inc.php

Skip rendering and reloading bind if there are no records, fixes #6350

Closes #6350

See merge request !1611

Avoid syslog errors about MySQL/MariaDB "Aborted connections" due to cron script.

Closes #6380

See merge request !1628

Add useful default extensions to sieve require template.  See #6382

See merge request !1630

Replace gentoo.conf.php

See merge request !1631

Fix.

See merge request !1632

Add wildcard path option to IDS whitelist.

Closes #6395

See merge request !1639