Added missing placeholder "Mailbox quota" in mail module.

tbrehm

2012-12-19 789ca03af109f35403f8ea965268fdce4f882ce5

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

@@ -44,4 +44,5 @@
$wb['Global Filters'] = 'Globale Filter';
$wb['Domain Alias'] = 'E-Mail Domain Alias';
$wb['Relay Recipients'] = 'Relay Empfänger';
$wb['Mailbox quota'] = 'Mailbox Speichernutzung';
?>