Does anybody know how i can combine zend_translate with a modular directory structure?

First i tried to add the translations directly into the module like so:

default/translations
default/controllers

In my IndexController.php i added:

public function init()
{
$this->_translation = new Zend_Translate(adapter, '../translations', null, array('scan' => Zend_Translate::LOCALE_DIRECTORY));
}

without any luck, then i tried:

translations/en/default/index/index
application/default/presenters/IndexController.php

added to my bootstrap:

$tr = new Zend_Translate(adapter, 'translations', null, array('scan' => 2));
$reg->set('tr', $tr);

and changed my init() to:

public function init()
{
// the registry key is set in my bootstrap
$this->_translation = Zend_Registry::get('tr');
}

but this does not function either.. and i doubt that using translations/en/index/index will work, maybe translations/module/en/index/index?

all help is greatly appreciated