diff --git a/adminer/include/bootstrap.inc.php b/adminer/include/bootstrap.inc.php
index abf82b84..a84e5bc7 100644
--- a/adminer/include/bootstrap.inc.php
+++ b/adminer/include/bootstrap.inc.php
@@ -39,7 +39,7 @@ if ($_GET["script"] == "version") {
 	exit;
 }
 
-global $adminer, $connection, $driver, $drivers, $edit_functions, $enum_length, $error, $functions, $grouping, $HTTPS, $inout, $jush, $LANG, $langs, $on_actions, $permanent, $structured_types, $has_token, $token, $translations, $types, $unsigned, $VERSION; // allows including Adminer inside a function
+global $adminer, $connection, $driver, $drivers, $edit_functions, $enum_length, $error, $functions, $grouping, $HTTPS, $inout, $jush, $LANG, $languages, $on_actions, $permanent, $structured_types, $has_token, $token, $translations, $types, $unsigned, $VERSION; // allows including Adminer inside a function
 
 if (!$_SERVER["REQUEST_URI"]) { // IIS 5 compatibility
 	$_SERVER["REQUEST_URI"] = $_SERVER["ORIG_PATH_INFO"];
diff --git a/adminer/include/design.inc.php b/adminer/include/design.inc.php
index c8947293..1a1d1b6e 100644
--- a/adminer/include/design.inc.php
+++ b/adminer/include/design.inc.php
@@ -197,7 +197,7 @@ function page_footer($missing = null)
 	echo "</div>"; // #content
 
 	echo "<div id='footer'>\n";
-	switch_lang();
+	language_select();
 
 	if ($missing != "auth") {
 ?>
diff --git a/adminer/include/lang.inc.php b/adminer/include/lang.inc.php
index 5de8bc0e..188e9288 100644
--- a/adminer/include/lang.inc.php
+++ b/adminer/include/lang.inc.php
@@ -1,7 +1,6 @@
 <?php
-// not used in a single language version
 
-$langs = array(
+$languages = [
 	'en' => 'English', // Jakub Vrána - https://www.vrana.cz
 	'ar' => 'العربية', // Y.M Amine - Algeria - nbr7@live.fr
 	'bg' => 'Български', // Deyan Delchev
@@ -25,8 +24,8 @@ $langs = array(
 	'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
+	'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
@@ -46,24 +45,59 @@ $langs = array(
 	'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() {
+/**
+ * Returns the list of available languages.
+ * In compiled version, only selected languages are returned.
+ *
+ * @return array
+ */
+function get_available_languages()
+{
+	global $languages;
+	return $languages; // compile: available languages
+}
+
+/**
+ * Converts translation key into the right form.
+ * In compiled version, string keys used in plugins are dynamically translated to numeric keys.
+ *
+ * @param string|int $key
+ *
+ * @return string|int
+ */
+function convert_translation_key($key)
+{
+	return $key; // compile: convert translation key
+}
+
+/**
+ * Returns current language.
+ *
+ * @return string
+ */
+function get_lang()
+{
 	global $LANG;
 	return $LANG;
 }
 
-/** Translate string
-* @param string
-* @param int
-* @return string
-*/
-function lang($idf, $number = null) {
+/**
+ * Returns translated text.
+ *
+ * @param string|int $key Numeric key is used in compiled version.
+ * @param ?int $number
+ *
+ * @return string
+ */
+function lang($key, $number = null)
+{
 	global $LANG, $translations;
-	$translation = ($translations[$idf] ? $translations[$idf] : $idf);
+
+	$key = convert_translation_key($key);
+	$translation = $translations[$key] ?: $key;
+
 	if (is_array($translation)) {
 		$pos = ($number == 1 ? 0
 			: ($LANG == 'cs' || $LANG == 'sk' ? ($number && $number < 5 ? 1 : 2) // different forms for 1, 2-4, other
@@ -74,21 +108,39 @@ function lang($idf, $number = null) {
 			: ($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;
+function language_select()
+{
+	global $LANG, $languages;
+
+	$available_languages = get_available_languages();
+	if (count($available_languages) == 1) {
+		return;
+	}
+
+	$options = [];
+	foreach ($languages as $language => $title) {
+		if (isset($available_languages[$language])) {
+			$options[$language] = $title;
+		}
+	}
+
 	echo "<div id='lang'><form action='' method='post'>\n";
-	echo lang('Language') . ": " . html_select("lang", $langs, $LANG, "this.form.submit();");
+	echo lang('Language') . ": " . html_select("lang", $options, $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 "</form></div>\n";
@@ -96,31 +148,37 @@ function switch_lang() {
 
 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
+	$_SESSION["translations"] = []; // used in compiled version
+
 	redirect(remove_from_uri());
 }
 
-$LANG = "en";
-if (isset($langs[$_COOKIE["adminer_lang"]])) {
+$available_languages = get_available_languages();
+$LANG = $available_languages[0];
+
+if (isset($available_languages[$_COOKIE["adminer_lang"]])) {
 	cookie("adminer_lang", $_COOKIE["adminer_lang"]);
 	$LANG = $_COOKIE["adminer_lang"];
-} elseif (isset($langs[$_SESSION["lang"]])) {
+} elseif (isset($available_languages[$_SESSION["lang"]])) {
 	$LANG = $_SESSION["lang"];
 } else {
-	$accept_language = array();
+	$accept_language = [];
 	preg_match_all('~([-a-z]+)(;q=([0-9.]+))?~', str_replace("_", "-", strtolower($_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[$key])) {
+		if (isset($available_languages[$key])) {
 			$LANG = $key;
 			break;
 		}
+
 		$key = preg_replace('~-.*~', '', $key);
-		if (!isset($accept_language[$key]) && isset($langs[$key])) {
+		if (!isset($accept_language[$key]) && isset($available_languages[$key])) {
 			$LANG = $key;
 			break;
 		}
diff --git a/compile.php b/compile.php
index 01716a71..013dc5e6 100755
--- a/compile.php
+++ b/compile.php
@@ -6,9 +6,18 @@ function adminer_errors($errno, $errstr) {
 
 error_reporting(6135); // errors and warnings
 set_error_handler('adminer_errors', E_WARNING);
+
+include dirname(__FILE__) . "/adminer/include/debug.inc.php";
 include dirname(__FILE__) . "/adminer/include/version.inc.php";
 include dirname(__FILE__) . "/vendor/vrana/jsshrink/jsShrink.php";
 
+function is_dev_version()
+{
+	global $VERSION;
+
+	return (bool)preg_match('~-dev$~', $VERSION);
+}
+
 function add_apo_slashes($s) {
 	return addcslashes($s, "\\'");
 }
@@ -21,85 +30,94 @@ function add_quo_slashes($s) {
 	return $return;
 }
 
-function remove_lang($match) {
-	global $translations;
-	$idf = strtr($match[2], array("\\'" => "'", "\\\\" => "\\"));
-	$s = ($translations[$idf] ? $translations[$idf] : $idf);
-	if ($match[3] == ",") { // lang() has parameters
-		return $match[1] . (is_array($s) ? "lang(array('" . implode("', '", array_map('add_apo_slashes', $s)) . "')," : "sprintf('" . add_apo_slashes($s) . "',");
-	}
-	return ($match[1] && $match[4] ? $s : "$match[1]'" . add_apo_slashes($s) . "'$match[4]");
-}
-
-function lang_ids($match) {
+function replace_lang($match) {
 	global $lang_ids;
-	$lang_id = &$lang_ids[stripslashes($match[1])];
-	if ($lang_id === null) {
-		$lang_id = count($lang_ids) - 1;
+
+	$text = stripslashes($match[1]);
+	if (!isset($lang_ids[$text])) {
+		$lang_ids[$text] = count($lang_ids);
 	}
-	return ($_SESSION["lang"] ? $match[0] : "lang($lang_id$match[2]");
+
+	return "lang($lang_ids[$text]$match[2]";
 }
 
 function put_file($match) {
-	global $project, $VERSION, $driver;
-	if (basename($match[2]) == '$LANG.inc.php') {
-		return $match[0]; // processed later
-	}
-	$return = file_get_contents(dirname(__FILE__) . "/$project/$match[2]");
-	if (basename($match[2]) == "file.inc.php") {
-		$return = str_replace("\n// caching headers added in compile.php", (preg_match('~-dev$~', $VERSION) ? '' : '
-if ($_SERVER["HTTP_IF_MODIFIED_SINCE"]) {
-	header("HTTP/1.1 304 Not Modified");
-	exit;
-}
+	global $project, $selected_languages, $driver;
 
-header("Expires: " . gmdate("D, d M Y H:i:s", time() + 365*24*60*60) . " GMT");
-header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
-header("Cache-Control: immutable");
-'), $return, $count);
+	$filename = basename($match[2]);
+
+	// Skip debug functions.
+	if ($filename == 'debug.inc.php') {
+		return "";
+	}
+
+	// Language is processed later.
+	if ($filename == '$LANG.inc.php') {
+		return $match[0];
+	}
+
+	$content = file_get_contents(dirname(__FILE__) . "/$project/$match[2]");
+
+	if ($filename == "file.inc.php") {
+		$content = str_replace("\n// caching headers added in compile.php", (is_dev_version() ? '' : '
+			if ($_SERVER["HTTP_IF_MODIFIED_SINCE"]) {
+				header("HTTP/1.1 304 Not Modified");
+				exit;
+			}
+
+			header("Expires: " . gmdate("D, d M Y H:i:s", time() + 365*24*60*60) . " GMT");
+			header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
+			header("Cache-Control: immutable");
+			'), $content, $count);
 		if (!$count) {
 			echo "adminer/file.inc.php: Caching headers placeholder not found\n";
 		}
 	}
-	if ($driver && dirname($match[2]) == "../adminer/drivers") {
-		$return = preg_replace('~^if \(isset\(\$_GET\["' . $driver . '"]\)\) \{(.*)^}~ms', '\1', $return);
-	}
-	if (basename($match[2]) != "lang.inc.php" || !$_SESSION["lang"]) {
-		if (basename($match[2]) == "lang.inc.php") {
-			$return = str_replace('function lang($idf, $number = null) {', 'function lang($idf, $number = null) {
-	if (is_string($idf)) { // compiled version uses numbers, string comes from a plugin
-		// English translation is closest to the original identifiers //! pluralized translations are not found
-		$pos = array_search($idf, get_translations("en")); //! this should be cached
-		if ($pos !== false) {
-			$idf = $pos;
-		}
-	}', $return, $count);
-			if (!$count) {
-				echo "lang() not found\n";
-			}
-		}
-		$tokens = token_get_all($return); // to find out the last token
-		return "?>\n$return" . (in_array($tokens[count($tokens) - 1][0], array(T_CLOSE_TAG, T_INLINE_HTML), true) ? "<?php" : "");
-	} elseif (preg_match('~\s*(\$pos = (.+\n).+;)~sU', $return, $match2)) {
-		// single language lang() is used for plural
-		return "function get_lang() {
-	return '$_SESSION[lang]';
-}
 
-function lang(\$translation, \$number = null) {
-	if (is_array(\$translation)) {
-		\$pos = $match2[2]\t\t\t: " . (preg_match("~\\\$LANG == '$_SESSION[lang]'.* \\? (.+)\n~U", $match2[1], $match3) ? $match3[1] : "1") . '
+	if ($driver && dirname($match[2]) == "../adminer/drivers") {
+		$content = preg_replace('~^if \(isset\(\$_GET\["' . $driver . '"]\)\) \{(.*)^}~ms', '\1', $content);
+	}
+
+	if ($filename == "lang.inc.php") {
+		$content = str_replace(
+			'return $key; // compile: convert translation key',
+			'static $en_translations = null;
+
+			// Convert string key used in plugins to compiled numeric key.
+			if (is_string($key)) {
+				if (!$en_translations) {
+					$en_translations = get_translations("en");
+				}
+
+				// Find text in English translations or plurals map.
+				if (($index = array_search($key, $en_translations)) !== false) {
+					$key = $index;
+				} elseif (($index = get_plural_translation_id($key)) !== null) {
+					$key = $index;
+				}
+			}
+
+			return $key;',
+			$content, $count
 		);
-		$translation = $translation[$pos];
-	}
-	$translation = str_replace("%d", "%s", $translation);
-	$number = format_number($number);
-	return sprintf($translation, $number);
-}
-';
-	} else {
-		echo "lang() \$pos not found\n";
+
+		if (!$count) {
+			echo "function lang() not found\n";
+		}
+
+		if ($selected_languages) {
+			$available_languages = array_fill_keys($selected_languages, true);
+			$content = str_replace(
+				'return $languages; // compile: available languages',
+				'return ' . var_export($available_languages, true) . ';',
+				$content
+			);
+		}
 	}
+
+	$tokens = token_get_all($content); // to find out the last token
+
+	return "?>\n$content" . (in_array($tokens[count($tokens) - 1][0], array(T_CLOSE_TAG, T_INLINE_HTML), true) ? "<?php" : "");
 }
 
 function lzw_compress($string) {
@@ -139,45 +157,73 @@ function lzw_compress($string) {
 	return $return . ($rest_length ? chr($rest << (8 - $rest_length)) : "");
 }
 
-function put_file_lang($match) {
-	global $lang_ids, $project, $langs;
-	if ($_SESSION["lang"]) {
-		return "";
-	}
-	$return = "";
-	foreach ($langs as $lang => $val) {
-		include dirname(__FILE__) . "/adminer/lang/$lang.inc.php"; // assign $translations
+function put_file_lang() {
+	global $lang_ids, $selected_languages;
+
+	$languages = array_map(function ($filename) {
+		preg_match('~/([^/.]+)\.inc\.php$~', $filename, $matches);
+		return $matches[1];
+	}, glob(dirname(__FILE__) . "/adminer/lang/*.inc.php"));
+
+	$cases = "";
+	$plurals_map = [];
+
+	foreach ($languages as $language) {
+		// Include only selected language and "en" into single language compilation.
+		// "en" is used for translations in plugins.
+		if ($selected_languages && !in_array($language, $selected_languages) && $language != "en") {
+			continue;
+		}
+
+		// Assign $translations
+		$translations = [];
+		include dirname(__FILE__) . "/adminer/lang/$language.inc.php";
+
 		$translation_ids = array_flip($lang_ids); // default translation
 		foreach ($translations as $key => $val) {
 			if ($val !== null) {
-				$translation_ids[$lang_ids[$key]] = implode("\t", (array) $val);
+				$translation_ids[$lang_ids[$key]] = $val;
+
+				if ($language == "en" && is_array($val)) {
+					$plurals_map[$key] = $lang_ids[$key];
+				}
 			}
 		}
-		$return .= '
-		case "' . $lang . '": $compressed = "' . add_quo_slashes(lzw_compress(implode("\n", $translation_ids))) . '"; break;';
-	}
-	$translations_version = crc32($return);
-	return '$translations = $_SESSION["translations"];
-if ($_SESSION["translations_version"] != ' . $translations_version . ') {
-	$translations = array();
-	$_SESSION["translations_version"] = ' . $translations_version . ';
-}
 
-function get_translations($lang) {
-	switch ($lang) {' . $return . '
+		$cases .= 'case "' . $language . '": $compressed = "' . add_quo_slashes(lzw_compress(json_encode($translation_ids, JSON_UNESCAPED_UNICODE))) . '"; break;';
 	}
-	$translations = array();
-	foreach (explode("\n", lzw_decompress($compressed)) as $val) {
-		$translations[] = (strpos($val, "\t") ? explode("\t", $val) : $val);
-	}
-	return $translations;
-}
 
-if (!$translations) {
-	$translations = get_translations($LANG);
-	$_SESSION["translations"] = $translations;
-}
-';
+	$translations_version = crc32($cases);
+
+	return '
+		function get_translations($lang) {
+			switch ($lang) {' . $cases . '}
+
+			return json_decode(lzw_decompress($compressed), true);
+		}
+
+		function get_plural_translation_id($key) {
+			$plurals_map = ' . var_export($plurals_map, true) . ';
+
+			return isset($plurals_map[$key]) ? $plurals_map[$key] : null;
+		}
+
+		$translations = $_SESSION["translations"];
+
+		if ($_SESSION["translations_version"] != ' . $translations_version . ') {
+			$translations = [];
+			$_SESSION["translations_version"] = ' . $translations_version . ';
+		}
+		if ($_SESSION["translations_language"] != $LANG) {
+			$translations = [];
+			$_SESSION["translations_language"] = $LANG;
+		}
+
+		if (!$translations) {
+			$translations = get_translations($LANG);
+			$_SESSION["translations"] = $translations;
+		}
+	';
 }
 
 function short_identifier($number, $chars) {
@@ -224,7 +270,7 @@ function php_shrink($input) {
 	}
 	$tokens = array_values($tokens);
 
-	foreach ($tokens as $i => $token) {
+	foreach ($tokens as $token) {
 		if ($token[0] === T_VARIABLE && !isset($special_variables[$token[1]])) {
 			$short_variables[$token[1]]++;
 		}
@@ -344,27 +390,31 @@ function number_type() {
 }
 
 $project = "adminer";
-if ($_SERVER["argv"][1] == "editor") {
+array_shift($argv);
+
+if ($argv[0] == "editor") {
 	$project = "editor";
-	array_shift($_SERVER["argv"]);
+	array_shift($argv);
 }
 
 $driver = "";
-if (file_exists(dirname(__FILE__) . "/adminer/drivers/" . $_SERVER["argv"][1] . ".inc.php")) {
-	$driver = $_SERVER["argv"][1];
-	array_shift($_SERVER["argv"]);
+if ($argv && file_exists(dirname(__FILE__) . "/adminer/drivers/" . $argv[0] . ".inc.php")) {
+	$driver = $argv[0];
+	array_shift($argv);
 }
 
-unset($_COOKIE["adminer_lang"]);
-$_SESSION["lang"] = $_SERVER["argv"][1]; // Adminer functions read language from session
-include dirname(__FILE__) . "/adminer/include/lang.inc.php";
-if (isset($langs[$_SESSION["lang"]])) {
-	include dirname(__FILE__) . "/adminer/lang/$_SESSION[lang].inc.php";
-	array_shift($_SERVER["argv"]);
+$selected_languages = [];
+if ($argv) {
+	$params = explode(",", $argv[0]);
+	if (file_exists(dirname(__FILE__) . "/adminer/lang/" . $params[0] . ".inc.php")) {
+		$selected_languages = $params;
+		array_shift($argv);
+	}
 }
+$single_language = count($selected_languages) == 1 ? $selected_languages[0] : null;
 
-if ($_SERVER["argv"][1]) {
-	echo "Usage: php compile.php [editor] [driver] [lang]\n";
+if ($argv) {
+	echo "Usage: php compile.php [editor] [driver] [language]\n";
 	echo "Purpose: Compile adminer[-driver][-lang].php or editor[-driver][-lang].php.\n";
 	exit(1);
 }
@@ -376,7 +426,7 @@ preg_match_all('~\bfunction ([^(]+)~', $file, $matches); //! respect context (ex
 $functions = array_combine($matches[1], $matches[0]);
 //! do not warn about functions without declared support()
 unset($functions["__construct"], $functions["__destruct"], $functions["set_charset"]);
-foreach (glob(dirname(__FILE__) . "/adminer/drivers/" . ($driver ? $driver : "*") . ".inc.php") as $filename) {
+foreach (glob(dirname(__FILE__) . "/adminer/drivers/" . ($driver ?: "*") . ".inc.php") as $filename) {
 	if ($filename != "mysql.inc.php") {
 		$file = file_get_contents($filename);
 		foreach ($functions as $val) {
@@ -389,8 +439,10 @@ foreach (glob(dirname(__FILE__) . "/adminer/drivers/" . ($driver ? $driver : "*"
 
 include dirname(__FILE__) . "/adminer/include/pdo.inc.php";
 include dirname(__FILE__) . "/adminer/include/driver.inc.php";
-$features = array("call" => "routine", "dump", "event", "privileges", "procedure" => "routine", "processlist", "routine", "scheme", "sequence", "status", "trigger", "type", "user" => "privileges", "variables", "view");
-$lang_ids = array(); // global variable simplifies usage in a callback function
+
+$features = ["call" => "routine", "dump", "event", "privileges", "procedure" => "routine", "processlist", "routine", "scheme", "sequence", "status", "trigger", "type", "user" => "privileges", "variables", "view"];
+$lang_ids = []; // global variable simplifies usage in a callback functions
+
 $file = file_get_contents(dirname(__FILE__) . "/$project/index.php");
 if ($driver) {
 	$_GET[$driver] = true; // to load the driver
@@ -413,6 +465,7 @@ if ($driver) {
 	$file = preg_replace('(include "../adminer/drivers/(?!' . preg_quote($driver) . '\.).*\s*)', '', $file);
 }
 $file = preg_replace_callback('~\b(include|require) "([^"]*)";~', 'put_file', $file); // bootstrap.inc.php
+
 if ($driver) {
 	foreach ($features as $feature) {
 		if (!support($feature)) {
@@ -430,19 +483,15 @@ if ($driver) {
 	}, $file);
 	//! strip doc_link() definition
 }
+
 if ($project == "editor") {
 	$file = preg_replace('~;\.\./vendor/vrana/jush/jush\.css~', '', $file);
 	$file = preg_replace('~compile_file\(\'\.\./(vendor/vrana/jush/modules/jush\.js|adminer/static/[^.]+\.gif)[^)]+\)~', "''", $file);
 }
-$file = preg_replace_callback("~lang\\('((?:[^\\\\']+|\\\\.)*)'([,)])~s", 'lang_ids', $file);
+
+$file = preg_replace_callback("~lang\\('((?:[^\\\\']+|\\\\.)*)'([,)])~s", 'replace_lang', $file);
 $file = preg_replace_callback('~\b(include|require) "([^"]*\$LANG.inc.php)";~', 'put_file_lang', $file);
 $file = str_replace("\r", "", $file);
-if ($_SESSION["lang"]) {
-	// single language version
-	$file = preg_replace_callback("~(<\\?php\\s*echo )?lang\\('((?:[^\\\\']+|\\\\.)*)'([,)])(;\\s*\\?>)?~s", 'remove_lang', $file);
-	$file = str_replace("switch_lang();\n", "", $file);
-	$file = str_replace('<?php echo $LANG; ?>', $_SESSION["lang"], $file);
-}
 $file = str_replace('<?php echo script_src("static/editing.js?" . filemtime("../adminer/static/editing.js")); ?>' . "\n", "", $file);
 $file = preg_replace('~\s+echo script_src\("\.\./vendor/vrana/jush/modules/jush-(textarea|txt|js|\$jush)\.js"\);~', '', $file);
 $file = str_replace('<link rel="stylesheet" type="text/css" href="../vendor/vrana/jush/jush.css">' . "\n", "", $file);
@@ -456,7 +505,12 @@ $file = preg_replace('~"\.\./vendor/vrana/jush/modules/(jush\.js)"~', $replace,
 $file = preg_replace("~<\\?php\\s*\\?>\n?|\\?>\n?<\\?php~", '', $file);
 $file = php_shrink($file);
 
-@mkdir("temp/export", 0777, true);
-$filename = "temp/export/$project" . (preg_match('~-dev$~', $VERSION) ? "" : "-$VERSION") . ($driver ? "-$driver" : "") . ($_SESSION["lang"] ? "-$_SESSION[lang]" : "") . ".php";
+@mkdir("temp", 0777, true);
+$filename = "temp/$project"
+	. (is_dev_version() ? "" : "-$VERSION")
+	. ($driver ? "-$driver" : "")
+	. ($single_language ? "-$single_language" : "")
+	. ".php";
+
 file_put_contents($filename, $file);
 echo "$filename created (" . strlen($file) . " B).\n";
diff --git a/lang.php b/lang.php
index 5b9b639b..4b0a6676 100755
--- a/lang.php
+++ b/lang.php
@@ -5,7 +5,7 @@ unset($_COOKIE["adminer_lang"]);
 $_SESSION["lang"] = isset($_SERVER["argv"][1]) ? $_SERVER["argv"][1] : null; // Adminer functions read language from session
 if (isset($_SESSION["lang"])) {
 	include dirname(__FILE__) . "/adminer/include/lang.inc.php";
-	if (isset($_SERVER["argv"][2]) || (!isset($langs[$_SESSION["lang"]]) && $_SESSION["lang"] != "xx")) {
+	if (isset($_SERVER["argv"][2]) || (!isset($languages[$_SESSION["lang"]]) && $_SESSION["lang"] != "xx")) {
 		echo "Usage: php lang.php [lang]\nPurpose: Update adminer/lang/*.inc.php from source code messages.\n";
 		exit(1);
 	}