i can't save a datasets, where have a HtmlEditorField. After Button-click is the backend empty.

my Code:

class FileArticleObject extends ImageObject {

static public $singular_name = 'Artikel';
static public $plural_name = 'Artikel';

static $db = array(
'Date' => 'Date'
);

public static $summary_fields = array(
'Picture.CMSThumbnail' => 'Foto',
'Date' => 'Date',
'Title' => 'Überschrift',
'Description' => 'Inhalt'

);

public function getCMSFields() {

$date = new DateField('Date', 'Datum');
$date->setConfig('showcalendar', true);

return new FieldList(
new TextField('Title', 'Überschrift'),
new HtmlEditorField('Description', 'Inhalt'),
$date,
new UploadField('Picture', 'Bilder')
);
}
}

additional:
the $summary_fields doesn't translate the columns.