Email Parser cuts ISO-8859-1 encoded headers

Hi,

when posting an article via eMail we observed, that longer subjects which are encoded in our standard ISO-8859-1 encoding are cut off.

So
'Wie ist der aktuelle Ablauf für die Installation einer Datenbank bei einem Neukunden?'
in the email subject will result in
'Wie ist der aktuelle Ablauf für die Installation einer'
as Article Question

When having a look at the mailbox.php class the reason seems obvious:
$headerOfValue = imap_mime_header_decode($value);
$header = $headerOfValue[0];
So for the subject header the imap_mime_header_decode function returns an array - and you are only using the first object.

This is the entire value of the subject
=?ISO-8859-1?Q?Wie_ist_der_aktuelle_Ablauf_f=FCr_die_Installation_einer?= =?ISO-8859-1?Q?_Datenbank_bei_einem_Neukunden=3F?=

Resulting in only one stdClass Object in the header variable
( [charset] => ISO-8859-1
[text] => Wie ist der aktuelle Ablauf für die Installation einer
)

Please fix.

Thanks,

Anna