adminerevo/adminer/include/lang.inc.php

<?php
// not used in a single language version

$langs = array(
	'en' => 'English', // Jakub Vrána - https://www.vrana.cz
	'ar' => 'العربية', // Y.M Amine - Algeria - nbr7@live.fr
	'bg' => 'Български', // Deyan Delchev
	'bn' => 'বাংলা', // Dipak Kumar - dipak.ndc@gmail.com | Hossain Ahmed Saiman - hossain.ahmed@altscope.com
	'bs' => 'Bosanski', // Emir Kurtovic
	'ca' => 'Català', // Joan Llosas
	'cs' => 'Čeština', // Jakub Vrána - https://www.vrana.cz
	'da' => 'Dansk', // Jarne W. Beutnagel - jarne@beutnagel.dk
	'de' => 'Deutsch', // Klemens Häckel - http://clickdimension.wordpress.com
	'el' => 'Ελληνικά', // Dimitrios T. Tanis - jtanis@tanisfood.gr
	'es' => 'Español', // Klemens Häckel - http://clickdimension.wordpress.com
	'et' => 'Eesti', // Priit Kallas
	'fa' => 'فارسی', // mojtaba barghbani - Iran - mbarghbani@gmail.com, Nima Amini - http://nimlog.com
	'fi' => 'Suomi', // Finnish - Kari Eveli - http://www.lexitec.fi/
	'fr' => 'Français', // Francis Gagné, Aurélien Royer
	'gl' => 'Galego', // Eduardo Penabad Ramos
	'he' => 'עברית', // Binyamin Yawitz - https://stuff-group.com/
	'hu' => 'Magyar', // Borsos Szilárd (Borsosfi) - http://www.borsosfi.hu, info@borsosfi.hu
	'id' => 'Bahasa Indonesia', // Ivan Lanin - http://ivan.lanin.org
	'it' => 'Italiano', // Alessandro Fiorotto, Paolo Asperti
	'ja' => '日本語', // Hitoshi Ozawa - http://sourceforge.jp/projects/oss-ja-jpn/releases/
	'ka' => 'ქართული', // Saba Khmaladze skhmaladze@uglt.org
	'ko' => '한국어', // dalli - skcha67@gmail.com
    'lv' => 'Latviešu', // Kristaps Lediņš - https://krysits.com
    'lt' => 'Lietuvių', // Paulius Leščinskas - http://www.lescinskas.lt
	'ms' => 'Bahasa Melayu', // Pisyek
	'nl' => 'Nederlands', // Maarten Balliauw - http://blog.maartenballiauw.be
	'no' => 'Norsk', // Iver Odin Kvello, mupublishing.com
	'pl' => 'Polski', // Radosław Kowalewski - http://srsbiz.pl/
	'pt' => 'Português', // André Dias
	'pt-br' => 'Português (Brazil)', // Gian Live - gian@live.com, Davi Alexandre davi@davialexandre.com.br, RobertoPC - http://www.robertopc.com.br
	'ro' => 'Limba Română', // .nick .messing - dot.nick.dot.messing@gmail.com
	'ru' => 'Русский', // Maksim Izmaylov; Andre Polykanine - https://github.com/Oire/
	'sk' => 'Slovenčina', // Ivan Suchy - http://www.ivansuchy.com, Juraj Krivda - http://www.jstudio.cz
	'sl' => 'Slovenski', // Matej Ferlan - www.itdinamik.com, matej.ferlan@itdinamik.com
	'sr' => 'Српски', // Nikola Radovanović - cobisimo@gmail.com
	'sv' => 'Svenska', // rasmusolle - https://github.com/rasmusolle
	'ta' => 'த‌மிழ்', // G. Sampath Kumar, Chennai, India, sampathkumar11@gmail.com
	'th' => 'ภาษาไทย', // Panya Saraphi, elect.tu@gmail.com - http://www.opencart2u.com/
	'tr' => 'Türkçe', // Bilgehan Korkmaz - turktron.com
	'uk' => 'Українська', // Valerii Kryzhov
	'vi' => 'Tiếng Việt', // Giang Manh @ manhgd google mail
	'zh' => '简体中文', // Mr. Lodar, vea - urn2.net - vea.urn2@gmail.com
	'zh-tw' => '繁體中文', // http://tzangms.com
);

/** Get current language
* @return string
*/
function get_lang() {
	global $LANG;
	return $LANG;
}

/** Translate string
* @param string
* @param int
* @return string
*/
function lang($idf, $number = null) {
	global $LANG, $translations;
	$translation = ($translations[$idf] ? $translations[$idf] : $idf);
	if (is_array($translation)) {
		$pos = ($number == 1 ? 0
			: ($LANG == 'cs' || $LANG == 'sk' ? ($number && $number < 5 ? 1 : 2) // different forms for 1, 2-4, other
			: ($LANG == 'fr' ? (!$number ? 0 : 1) // different forms for 0-1, other
			: ($LANG == 'pl' ? ($number % 10 > 1 && $number % 10 < 5 && $number / 10 % 10 != 1 ? 1 : 2) // different forms for 1, 2-4 except 12-14, other
			: ($LANG == 'sl' ? ($number % 100 == 1 ? 0 : ($number % 100 == 2 ? 1 : ($number % 100 == 3 || $number % 100 == 4 ? 2 : 3))) // different forms for 1, 2, 3-4, other
			: ($LANG == 'lt' ? ($number % 10 == 1 && $number % 100 != 11 ? 0 : ($number % 10 > 1 && $number / 10 % 10 != 1 ? 1 : 2)) // different forms for 1, 12-19, other
			: ($LANG == 'bs' || $LANG == 'ru' || $LANG == 'sr' || $LANG == 'uk' ? ($number % 10 == 1 && $number % 100 != 11 ? 0 : ($number % 10 > 1 && $number % 10 < 5 && $number / 10 % 10 != 1 ? 1 : 2)) // different forms for 1 except 11, 2-4 except 12-14, other
			: 1 // different forms for 1, other
		))))))); // http://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html
		$translation = $translation[$pos];
	}
	$args = func_get_args();
	array_shift($args);
	$format = str_replace("%d", "%s", $translation);
	if ($format != $translation) {
		$args[0] = format_number($number);
	}
	return vsprintf($format, $args);
}

function switch_lang() {
	global $LANG, $langs;
	echo "<form action='' method='post'>\n<div id='lang'>";
	echo lang('Language') . ": " . html_select("lang", $langs, $LANG, "this.form.submit();");
	echo " <input type='submit' value='" . lang('Use') . "' class='hidden'>\n";
	echo "<input type='hidden' name='token' value='" . get_token() . "'>\n"; // $token may be empty in auth.inc.php
	echo "</div>\n</form>\n";
}

if (isset($_POST["lang"]) && verify_token()) { // $error not yet available
	cookie("adminer_lang", $_POST["lang"]);
	$_SESSION["lang"] = $_POST["lang"]; // cookies may be disabled
	$_SESSION["translations"] = array(); // used in compiled version
	redirect(remove_from_uri());
}

$LANG = "en";
if (isset($langs[$_COOKIE["adminer_lang"]])) {
	cookie("adminer_lang", $_COOKIE["adminer_lang"]);
	$LANG = $_COOKIE["adminer_lang"];
} elseif (isset($langs[$_SESSION["lang"]])) {
	$LANG = $_SESSION["lang"];
} else {
	$accept_language = array();
	preg_match_all('~([-a-z]+)(;q=([0-9.]+))?~', str_replace("_", "-", strtolower($_SERVER["HTTP_ACCEPT_LANGUAGE"])), $matches, PREG_SET_ORDER);
	foreach ($matches as $match) {
		$accept_language[$match[1]] = (isset($match[3]) ? $match[3] : 1);
	}
	arsort($accept_language);
	foreach ($accept_language as $key => $q) {
		if (isset($langs[$key])) {
			$LANG = $key;
			break;
		}
		$key = preg_replace('~-.*~', '', $key);
		if (!isset($accept_language[$key]) && isset($langs[$key])) {
			$LANG = $key;
			break;
		}
	}
}