Translations aren't possible for existing fieldable panel panes

When installing entity translation it's not possible to translate existing fieldable panel panes. Here a workaround but there should be an easier way:

//devel/php

$fp = fieldable_panels_panes_load($fpid, $vid);
$fp->language = 'en'; // was 'und'
$fp->translations->original = 'en';  // was 'und'
$fp->translations->data['en'] = $fp->translations->data['und'];
$fp->translations->data['en']['language'] = 'en';
unset($fp->translations->data['und']);
fieldable_panels_panes_save($fp);
dsm($fp);