Merge branch 'develop' of https://git.ispconfig.org/ispconfig/ispconfig3 into develop

install/tpl/apache_ispconfig.conf.master

interface/lib/classes/auth.inc.php

interface/lib/classes/remote.d/mail.inc.php

interface/lib/classes/validate_password.inc.php

interface/web/admin/lib/lang/ar_directive_snippets.lng

interface/web/admin/lib/lang/bg_directive_snippets.lng

interface/web/admin/lib/lang/ca_directive_snippets.lng

interface/web/admin/lib/lang/cz_directive_snippets.lng

interface/web/admin/lib/lang/de_directive_snippets.lng

interface/web/admin/lib/lang/dk_directive_snippets.lng

interface/web/admin/lib/lang/el_directive_snippets.lng

interface/web/admin/lib/lang/en_directive_snippets.lng

interface/web/admin/lib/lang/es_directive_snippets.lng

interface/web/admin/lib/lang/fi_directive_snippets.lng

interface/web/admin/lib/lang/fr_directive_snippets.lng

interface/web/admin/lib/lang/hr_directive_snippets.lng

interface/web/admin/lib/lang/hu_directive_snippets.lng

interface/web/admin/lib/lang/id_directive_snippets.lng

interface/web/admin/lib/lang/it_directive_snippets.lng

interface/web/admin/lib/lang/ja_directive_snippets.lng