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/highlight-prism.php

@@ -65,5 +65,6 @@ if (el) {
 		'de' => array('' => 'Prism Code Editor verwenden, für die Syntaxhervorhebung und <textarea>'),
 		'ja' => array('' => '構文や <textarea> の強調表示に Prism Code Editor を使用'),
 		'pl' => array('' => 'Użyj Prism Code Editora do podświetlania składni i <textarea>'),
+		'hr' => array('' => 'Koristi Prism Code Editor za isticanje sintakse i SQL <textarea>'),
 	);
 }