Magento 2.0 translation

I am - as a basic magento user - trying to translate to dutch, but it is not working as expected. I've had a clean install in 2.0.

What did I do?

1. I've created a directory in app/i18n/test/nl_nl
2. I've copied the files from vendor/magento/language-nl_nl to app/i18n/test/nl_nl and changed it to:

composer.json

{ "name": "magento/language-nl_nl”, "description": "Dutch (Netherlands) language", "version": "100.0.2", "license": [ "OSL-3.0", "AFL-3.0" ], "require": { "magento/framework": "100.0.*" }, "type": "magento2-language", "autoload": { "files": [ "registration.php" ] } } 

Language.xml

<?xml version="1.0"?> <!-- /** * Copyright © 2015 Magento. All rights reserved. * See COPYING.txt for license details. */ --> <language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd"> <code>nl_NL</code> <vendor>magento</vendor> <package>nl_nl</package> </language> 

Registration.php

<?php /** * Copyright © 2015 Magento. All rights reserved. * See COPYING.txt for license details. */ \Magento\Framework\Component\ComponentRegistrar::register( \Magento\Framework\Component\ComponentRegistrar::LANGUAGE, 'nl_nl', __DIR__ ); 

3. I've added a nl_NL.csv file "Search entire store here...","Zoek TESTING..."

4. Cached

And ... Nothing! Anybody willing to hint me a clue this christmas?

Thank in advance!