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/tables-filter.php

@@ -85,5 +85,9 @@ sessionStorage && document.addEventListener('DOMContentLoaded', () => {
 		'ja' => array(
 			'' => 'テーブル一覧をテーブル名でフィルタリング',
 		),
+		'hr' => array(
+			'' => 'Filtriranje tablice prema imenu',
+			'Filter' => 'Filtar',
+		),
 	);
 }