Name of contact type not always translated

On the page of a new household:

/civicrm/contact/add?ct=Household&reset=1

The title (both on the html title and the main title in the page, aren't translated.

It seems it's line 166 of CRM/Contact/Form/Edit.php
if ( $this->_contactSubType )

{ CRM_Utils_System::setTitle( ts( 'New %1', array(1 => $this->_contactSubType ) ) ); }

else

{ CRM_Utils_System::setTitle( ts( 'New %1', array(1 => $this->_contactType ) ) ); }

I don't know what the subtypes are, can't provide a patch