gistfile1.php

<?php

echo $this->Form->input(
    'SelectedLanguage',
    array(
        'type' => 'hidden',
        'div' => false,
        'onchange' => 'this.form.submit()',
        'options' => Configure::read('Localization.languageAliases'),
        'default' => Configure::read('Config.language')
    )
);