Module.php

<?php
namespace Application;

use Locale;
use Zend\EventManager\Event;
use Zend\ModuleManager\Feature;

class Module implements
    Feature\BootstrapListenerInterface
{
    public function onBootstrap(Event $e)
    {
        $default   = 'nl';
        $supported = array('en', 'en-GB');
        $app       = $e->getApplication();
        $headers   = $app->getRequest()->getHeaders();

        if ($headers->has('Accept-Language')) {
            $locales = $headers->get('Accept-Language')->getPrioritized();

            // Loop through all locales, highest priority first
            foreach ($locales as $locale) {
                if (!!($match = Locale::lookup($supported, $locale))) {
                    // The locale is one of our supported list
                    Locale::setDefault($match);
                    break;
                }
            }
            if (!$match) {
                // Nothing from the supported list is a match
                Locale::setDefault($default);
            }
        } else {
            Locale::setDefault($default);
        }
    }
}