Enhancements on German translation files (Ported from ssh -Q)

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

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

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

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

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

interface/web/sites/lib/lang/de.lng

interface/web/sites/lib/lang/de_backup_stats_list.lng

...rface/web/sites/lib/lang/de_database_quota_stats_list.lng

interface/web/sites/lib/lang/de_ftp_sites_stats_list.lng

interface/web/sites/lib/lang/de_shell_user.lng

interface/web/sites/lib/lang/de_web_subdomain.lng

interface/web/sites/lib/lang/de_web_vhost_domain.lng