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/sql-gemini.php

@@ -116,5 +116,10 @@ geminiText.onkeydown = event => {
 			'Ask Gemini' => 'Gemini に聞く',
 			'Just a sec...' => 'しばらくお待ち下さい...',
 		),
+		'hr' => array(
+			'' => 'Generiranje SQL naredbi pomoću Google Gemini AI',
+			'Ask Gemini' => 'Pitaj Gemini',
+			'Just a sec...' => 'Samo trenutak...',
+		),
 	);
 }