RelatedSource
A very strange Accept-Language which might be coming from a proxy, this rule `x-ns…` must be ignored.

Source

						public function testPreferredMalformedSquid() {
		$available = array('fr', 'de');

		$squid = 'fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3,x-ns14sRVhG$uNxh';
		$request = new ActionRequest(array(
			'env' => array('HTTP_ACCEPT_LANGUAGE' => $squid)
		));
		$result = Locale::preferred($request, $available);
		$this->assertIdentical('fr', $result);
	}