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/dump-bz2.php

@@ -43,5 +43,6 @@ class AdminerDumpBz2 extends Adminer\Plugin {
 		'pl' => array('' => 'Zrzuć do formatu Bzip2'),
 		'ro' => array('' => 'Dump în format Bzip2'),
 		'ja' => array('' => 'Bzip2 形式でエクスポート'),
+		'hr' => array('' => 'Izvoz u Bzip2 format'),
 	);
 }