Fixed error 404 when PHP-FPM is used and PHP script does not exists.

See merge request ispconfig/ispconfig3!990

Added missing translating functions and fixed the language editor

See merge request ispconfig/ispconfig3!994

misc centos 8 fixes

See merge request ispconfig/ispconfig3!996

This reverts commit 13c9e0ba

This reverts commit 2548cc13

Example csv import email script.

See merge request !988

Update php_fpm_pool.conf.master - removed php_admin_value[cgi.fix_pathinfo]

See merge request ispconfig/ispconfig3!981

Allow updating sysuser modules through remoting

See merge request ispconfig/ispconfig3!984

Reconfigure incron if the PHP version changes

See merge request ispconfig/ispconfig3!983

Don't use short array syntax

See merge request !982

Update php_fpm_pool.conf.master - removed php_admin_value[cgi.fix_pathinfo] = 0 which cause in fpm chroot errors: Access to the script has been denied (see security.limit_extensions). This settings is obsolete for newer PHP version. More info: https://www.howtoforge.com/community/threads/php-fpm-chroot-with-cgi-fix_pathinfo-0-causes-access-to-the-script-has-been-denied.84071/

Add additional option to frontend, #5325

See merge request ispconfig/ispconfig3!906

#4617 dont trigger change for fastcgi php version reload

See merge request ispconfig/ispconfig3!958

Exclude IP's from maintenance

See merge request ispconfig/ispconfig3!975