User can not translate new node creation URL, because it is hard coded instead using t() function. String 97 of popups_reference.module:
$form[$key]['#suffix'] = '

Add New: ' . implode(', ', $links) .'

';
It should be the following:
$form[$key]['#suffix'] = '

' .t('Add New') .': ' .implode(', ', $links) .'

';
The same bug is in line 139:
- $links[] = l("Add $name", $path, $options);
+ $links[] = l(t('Add') ." $name", $path, $options);