Accessing object methods from inside Volt templates

Hey,

I'm trying to provide access to \Phalcon\Translate\Adapter\NativeArray on a global scale by setting it as a view var in my controller:

<?php
$mainTranslate = new \Phalcon\Translate\Adapter\NativeArray(array('content' => $messages));
$this->view->setVar('t', $mainTranslate);

However, from inside the Volt template, I can not access the method of t as it should work (in case I understood the docs right):

<title>{{ t._('Hi') }}</title>

All I get is the following error:

Parsing error before '('Hi') }}

What am I doing wrong?

Thanks in advance!

Best,