Add Croatian (hr) translation

Add complete Croatian translation for Adminer, including all strings
in adminer/lang/hr.inc.php, plural forms support in lang.inc.php,
and Croatian descriptions and translations for all plugins.

plugins/login-servers.php

@@ -44,5 +44,6 @@ class AdminerLoginServers extends Adminer\Plugin {
 		'pl' => array('' => 'Wyświetlaj stałą listę serwerów w formularzu logowania'),
 		'ro' => array('' => 'Afișarea unei liste constante de servere în formularul de conectare'),
 		'ja' => array('' => 'ログイン画面に定義済のサーバリストを表示'),
+		'hr' => array('' => 'Prikazuje konstantan popis poslužitelja u obrascu za prijavu'),
 	);
 }