Can't access multidimensional array in language file

Hello,

I'm trying to make a multilingual site but i'm having problems using multidimensional arrays in the language file.

This is in my DI:

$di->setShared('trans', function() use($di) { 
    require APP_DIR . "/lang/en.php";

    return new \Phalcon\Translate\Adapter\NativeArray(array(
        "content" => $t
    ));
});

this is app/lang/en.php

<?php
$t = array(
    "hi"    => "Hello",
    "bye"   => "Good Bye",
    "test"  => array('AA' => 'Option A', 'BB' => 'Option B')
);

Now, when i do

var_dump($this->trans);

I get

object(Phalcon\Translate\Adapter\NativeArray)[69]
  protected '_interpolator' => 
    object(Phalcon\Translate\Interpolator\AssociativeArray)[70]
  protected '_translate' => 
    array (size=3)
      'hi' => string 'Hello' (length=5)
      'bye' => string 'Good Bye' (length=8)
      'test' => 
        array (size=2)
          'AA' => string 'Option A' (length=8)
          'BB' => string 'Option B' (length=8)

Everything looking fine. I can also access each key in the array, e.g. var_dump($this->trans['hi'] results in string 'Hello' (length=5)

But when i try to access the test array, e.g. by writing var_dump($this->trans['test']);

i always get

Parameter 'translation' must be a string

Is there any way i can access this array?

Thank you