Merge branch 'master' into 'master'

interface/lib/classes/plugin_backuplist.inc.php

interface/lib/classes/plugin_backuplist_mail.inc.php

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

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

interface/web/mail/lib/lang/ar_mail_backup_list.lng

interface/web/mail/lib/lang/bg_mail_backup_list.lng

interface/web/mail/lib/lang/br_mail_backup_list.lng

interface/web/mail/lib/lang/cz_mail_backup_list.lng

interface/web/mail/lib/lang/de_mail_backup_list.lng

interface/web/mail/lib/lang/el_mail_backup_list.lng

interface/web/mail/lib/lang/en_mail_backup_list.lng

interface/web/mail/lib/lang/es_mail_backup_list.lng

interface/web/mail/lib/lang/fi_mail_backup_list.lng

interface/web/mail/lib/lang/fr_mail_backup_list.lng

interface/web/mail/lib/lang/hr_mail_backup_list.lng

interface/web/mail/lib/lang/hu_mail_backup_list.lng

interface/web/mail/lib/lang/id_mail_backup_list.lng

interface/web/mail/lib/lang/it_mail_backup_list.lng

interface/web/mail/lib/lang/ja_mail_backup_list.lng

interface/web/mail/lib/lang/nl_mail_backup_list.lng