diff --git a/.tests/tests/ImportTest.php b/.tests/tests/ImportTest.php
index 0d51750..0febee2 100644
--- a/.tests/tests/ImportTest.php
+++ b/.tests/tests/ImportTest.php
@@ -3,7 +3,7 @@
 require_once(__DIR__ . "/../lib/UloggerAPITestCase.php");
 if (!defined("ROOT_DIR")) { define("ROOT_DIR", __DIR__ . "/../.."); }
 require_once(ROOT_DIR . "/helpers/config.php");
-require_once(ROOT_DIR . "/lang.php");
+require_once(ROOT_DIR . "/helpers/lang.php");
 
 class ImportTest extends UloggerAPITestCase {
 
@@ -609,7 +609,7 @@ class ImportTest extends UloggerAPITestCase {
   }
 
   public function testImportNoLongitude() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
 
     $this->assertEquals(0, $this->getConnection()->getRowCount("tracks"), "Wrong row count");
@@ -656,7 +656,7 @@ class ImportTest extends UloggerAPITestCase {
   }
 
   public function testImportNoLatitude() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
 
     $this->assertEquals(0, $this->getConnection()->getRowCount("tracks"), "Wrong row count");
@@ -703,7 +703,7 @@ class ImportTest extends UloggerAPITestCase {
   }
 
   public function testImportNoGPX() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
 
     $this->assertEquals(0, $this->getConnection()->getRowCount("tracks"), "Wrong row count");
@@ -744,7 +744,7 @@ class ImportTest extends UloggerAPITestCase {
   }
 
   public function testImportCorrupt() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
 
     $this->assertEquals(0, $this->getConnection()->getRowCount("tracks"), "Wrong row count");
diff --git a/.tests/tests/InternalAPITest.php b/.tests/tests/InternalAPITest.php
index 29fc7de..94c0550 100644
--- a/.tests/tests/InternalAPITest.php
+++ b/.tests/tests/InternalAPITest.php
@@ -3,7 +3,7 @@
 require_once(__DIR__ . "/../lib/UloggerAPITestCase.php");
 if (!defined("ROOT_DIR")) { define("ROOT_DIR", __DIR__ . "/../.."); }
 require_once(ROOT_DIR . "/helpers/config.php");
-require_once(ROOT_DIR . "/lang.php");
+require_once(ROOT_DIR . "/helpers/lang.php");
 
 class InternalAPITest extends UloggerAPITestCase {
 
@@ -527,7 +527,6 @@ class InternalAPITest extends UloggerAPITestCase {
   /* handletrack.php */
 
   public function testHandleTrackDeleteAdmin() {
-    global $lang;
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $userId = $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
@@ -551,7 +550,6 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleTrackDeleteSelf() {
-    global $lang;
     $userId = $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
     $this->assertTrue($this->authenticate($this->testUser, $this->testPass), "Authentication failed");
@@ -575,7 +573,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleTrackDeleteOtherUser() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
     $this->assertTrue($this->authenticate($this->testUser, $this->testPass), "Authentication failed");
@@ -597,7 +595,6 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleTrackUpdate() {
-    global $lang;
     $newName = "New name";
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $userId = $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
@@ -639,7 +636,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleTrackUpdateEmptyName() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $userId = $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
@@ -663,7 +660,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleTrackUpdateNonexistantTrack() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $newName = "New name";
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $userId = $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
@@ -687,8 +684,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleTrackMissingAction() {
-    global $lang;
-
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
 
     $options = [
@@ -706,8 +702,7 @@ class InternalAPITest extends UloggerAPITestCase {
   /* handleuser.php */
 
   public function testHandleUserMissingAction() {
-    global $lang;
-
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
 
     $options = [
@@ -722,8 +717,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleUserNonAdmin() {
-    global $lang;
-
+    $lang = (new uLang("en"))->getStrings();
     $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
     $this->assertTrue($this->authenticate($this->testUser, $this->testPass), "Authentication failed");
@@ -743,8 +737,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleUserSelf() {
-    global $lang;
-
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $this->assertEquals(1, $this->getConnection()->getRowCount("users"), "Wrong row count");
 
@@ -762,8 +755,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleUserEmptyLogin() {
-    global $lang;
-
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $this->assertEquals(1, $this->getConnection()->getRowCount("users"), "Wrong row count");
 
@@ -781,7 +773,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleUserNoAuth() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
 
@@ -825,8 +817,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleUserAddSameLogin() {
-    global $lang;
-
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
@@ -864,7 +855,7 @@ class InternalAPITest extends UloggerAPITestCase {
   }
 
   public function testHandleUserUpdateEmptyPass() {
-    global $lang;
+    $lang = (new uLang("en"))->getStrings();
     $this->assertTrue($this->authenticate(), "Authentication failed");
     $this->addTestUser($this->testUser, password_hash($this->testPass, PASSWORD_DEFAULT));
     $this->assertEquals(2, $this->getConnection()->getRowCount("users"), "Wrong row count");
diff --git a/.tests/tests/LangTest.php b/.tests/tests/LangTest.php
new file mode 100644
index 0000000..4078306
--- /dev/null
+++ b/.tests/tests/LangTest.php
@@ -0,0 +1,32 @@
+<?php
+use PHPUnit\Framework\TestCase;
+
+require_once(__DIR__ . "/../../helpers/config.php");
+require_once(__DIR__ . "/../../helpers/lang.php");
+
+class LangTest extends TestCase {
+
+  public function testGetLanguages() {
+    $languages = uLang::getLanguages();
+    $this->assertNotEmpty($languages);
+    $this->assertArrayHasKey("en", $languages);
+    $this->assertArrayHasKey("pl", $languages);
+    $this->assertEquals("English", $languages["en"]);
+    $this->assertEquals("Polski", $languages["pl"]);
+  }
+
+  public function testGetStrings() {
+    $lang = new uLang("en");
+    $this->assertEquals("User", $lang->getStrings()["user"]);
+    $lang = new uLang("pl");
+    $this->assertEquals("Użytkownik", $lang->getStrings()["user"]);
+  }
+
+  public function testGetSetupStrings() {
+    $lang = new uLang("en");
+    $this->assertEquals("Congratulations!", $lang->getSetupStrings()["congratulations"]);
+    $lang = new uLang("pl");
+    $this->assertEquals("Gratulacje!", $lang->getSetupStrings()["congratulations"]);
+  }
+}
+?>
diff --git a/helpers/lang.php b/helpers/lang.php
new file mode 100644
index 0000000..d405587
--- /dev/null
+++ b/helpers/lang.php
@@ -0,0 +1,115 @@
+<?php
+/* μlogger
+ *
+ * Copyright(C) 2019 Bartek Fabiszewski (www.fabiszewski.net)
+ *
+ * This is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+  require_once(ROOT_DIR . "/helpers/config.php");
+
+  /**
+  * Localization
+  */
+  class uLang {
+
+    /**
+     * Available languages
+     *
+     * @var array
+     */
+    private static $languages = [
+      "en" => "English",
+      "pl" => "Polski",
+      "de" => "Deutsch",
+      "hu" => "Magyar",
+      "fr" => "Français",
+      "it" => "Italiano",
+      "es" => "Español",
+      "nl" => "Nederlands",
+      "zh" => "中文"
+    ];
+
+    /**
+     * Application strings
+     * Array of key => translation pairs
+     *
+     * @var array
+     */
+    private $strings = [];
+    /**
+     * Setup script strings
+     * Array of key => translation pairs
+     *
+     * @var array
+     */
+    private $setupStrings = [];
+
+    /**
+     * Constructor
+     *
+     * @param string $language Language code (IANA)
+     */
+    public function __construct($language = "en") {
+      $lang = [];
+      $langSetup = [];
+      // always load en base
+      require(ROOT_DIR . "/lang/en.php");
+
+      // override with translated strings if needed
+      // missing strings will be displayed in English
+      if ($language != "en" && array_key_exists($language, self::$languages)) {
+        require(ROOT_DIR . "/lang/$language.php");
+      }
+
+      // choose password messages based on config
+      $lang['passrules'] = isset($lang["passrules_" . uConfig::$pass_strength]) ? $lang["passrules_" . uConfig::$pass_strength] : "";
+      $lang['passlenmin'] = sprintf($lang["passlenmin"], uConfig::$pass_lenmin);
+      $this->strings = $lang;
+      $this->setupStrings = $langSetup;
+    }
+
+    /**
+     * Get supported languages array
+     * Language code => Native language name
+     *
+     * @return array
+     */
+    public static function getLanguages() {
+      return self::$languages;
+    }
+
+    /**
+     * Get translated strings array
+     * Key => translation string
+     *
+     * @return array
+     */
+    public function getStrings() {
+      return $this->strings;
+    }
+
+    /**
+     * Get translated strings array for setup script
+     * Key => translation string
+     *
+     * @return array
+     */
+    public function getSetupStrings() {
+      return $this->setupStrings;
+    }
+
+  }
+
+ ?>
\ No newline at end of file
diff --git a/index.php b/index.php
index 16e74df..dabfc2b 100755
--- a/index.php
+++ b/index.php
@@ -22,12 +22,16 @@
   require_once(ROOT_DIR . "/helpers/position.php");
   require_once(ROOT_DIR . "/helpers/track.php");
   require_once(ROOT_DIR . "/helpers/utils.php");
-  require_once(ROOT_DIR . "/lang.php");
+  require_once(ROOT_DIR . "/helpers/lang.php");
 
   $login = uUtils::postString('user');
   $pass = uUtils::postPass('pass');
   $action = uUtils::postString('action');
 
+  $lang = (new uLang(uConfig::$lang))->getStrings();
+  $langsArr = uLang::getLanguages();
+  asort($langsArr);
+
   $auth = new uAuth();
   if ($action == "auth") {
     $auth->checkLogin($login, $pass);
@@ -169,7 +173,6 @@
           <div class="menutitle"><?= $lang["language"] ?></div>
           <form>
             <select name="units" onchange="setLang(this.options[this.selectedIndex].value);">
-              <?php asort($langsArr); ?>
               <?php foreach ($langsArr as $langCode => $langName): ?>
                 <option value="<?= $langCode ?>"<?= (uConfig::$lang == $langCode) ? " selected" : "" ?>><?= $langName ?></option>
               <?php endforeach; ?>
diff --git a/lang.php b/lang.php
deleted file mode 100755
index c3877f9..0000000
--- a/lang.php
+++ /dev/null
@@ -1,46 +0,0 @@
-<?php
-/* μlogger
- *
- * Copyright(C) 2017 Bartek Fabiszewski (www.fabiszewski.net)
- *
- * This is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-  // available languages
-  $langsArr = [
-    "en" => "English",
-    "pl" => "Polski",
-    "de" => "Deutsch",
-    "hu" => "Magyar",
-    "fr" => "Français",
-    "it" => "Italiano",
-    "es" => "Español",
-    "nl" => "Nederlands",
-    "zh" => "中文"
-  ];
-
-  // always load en base
-  require_once(ROOT_DIR . "/lang/en.php");
-
-  // override with translated strings if needed
-  // missing strings will be displayed in English
-  if (uConfig::$lang != "en" && array_key_exists(uConfig::$lang, $langsArr)) {
-    require_once(ROOT_DIR . "/lang/" . uConfig::$lang . ".php");
-  }
-
-  // choose password messages based on config
-  $lang['passrules'] = isset($lang["passrules_" . uConfig::$pass_strength]) ? $lang["passrules_" . uConfig::$pass_strength] : "";
-  $lang['passlenmin'] = sprintf($lang["passlenmin"], uConfig::$pass_lenmin);
-
-?>
diff --git a/login.php b/login.php
index 3de41ec..60aae67 100644
--- a/login.php
+++ b/login.php
@@ -18,11 +18,13 @@
  */
 
   require_once("helpers/auth.php");
-  require_once(ROOT_DIR . "/lang.php");
+  require_once(ROOT_DIR . "/helpers/lang.php");
   require_once(ROOT_DIR . "/helpers/config.php");
 
   $auth_error = uUtils::getBool('auth_error', false);
 
+  $lang = (new uLang(uConfig::$lang))->getStrings();
+
 ?>
 <!DOCTYPE html>
 <html>
diff --git a/scripts/setup.php b/scripts/setup.php
index e3aedff..9481710 100644
--- a/scripts/setup.php
+++ b/scripts/setup.php
@@ -32,10 +32,13 @@ define("ROOT_DIR", dirname(__DIR__));
 require_once(ROOT_DIR . "/helpers/user.php");
 require_once(ROOT_DIR . "/helpers/config.php");
 require_once(ROOT_DIR . "/helpers/utils.php");
-require_once(ROOT_DIR . "/lang.php");
+require_once(ROOT_DIR . "/helpers/lang.php");
 
 $command = uUtils::postString('command');
 
+$lang = (new uLang(uConfig::$lang))->getStrings();
+$langSetup = (new uLang(uConfig::$lang))->getSetupStrings();
+
 $prefix = preg_replace('/[^a-z0-9_]/i', '', uConfig::$dbprefix);
 $tPositions = $prefix . "positions";
 $tTracks = $prefix . "tracks";
diff --git a/utils/export.php b/utils/export.php
index 2f30666..f5f1005 100755
--- a/utils/export.php
+++ b/utils/export.php
@@ -19,10 +19,11 @@
 
 require_once(dirname(__DIR__) . "/helpers/auth.php");
 require_once(ROOT_DIR . "/helpers/position.php");
-require_once(ROOT_DIR . "/lang.php");
-
+require_once(ROOT_DIR . "/helpers/lang.php");
+require_once(ROOT_DIR . "/helpers/config.php");
 
 $auth = new uAuth();
+$lang = (new uLang(uConfig::$lang))->getStrings();
 
 /**
  * Add kml marker style element
diff --git a/utils/handletrack.php b/utils/handletrack.php
index 164f6a3..894ba3c 100644
--- a/utils/handletrack.php
+++ b/utils/handletrack.php
@@ -18,9 +18,10 @@
  */
 
   require_once(dirname(__DIR__) . "/helpers/auth.php");
-  require_once(ROOT_DIR . "/lang.php");
+  require_once(ROOT_DIR . "/helpers/lang.php");
   require_once(ROOT_DIR . "/helpers/track.php");
   require_once(ROOT_DIR . "/helpers/utils.php");
+  require_once(ROOT_DIR . "/helpers/config.php");
 
   $auth = new uAuth();
 
@@ -28,6 +29,8 @@
   $trackId = uUtils::postInt('trackid');
   $trackName = uUtils::postString('trackname');
 
+  $lang = (new uLang(uConfig::$lang))->getStrings();
+
   if (empty($action) || empty($trackId)) {
     uUtils::exitWithError($lang["servererror"]);
   }
diff --git a/utils/handleuser.php b/utils/handleuser.php
index d2800b6..fdad0f5 100644
--- a/utils/handleuser.php
+++ b/utils/handleuser.php
@@ -18,7 +18,8 @@
  */
 
   require_once(dirname(__DIR__) . "/helpers/auth.php");
-  require_once(ROOT_DIR . "/lang.php");
+  require_once(ROOT_DIR . "/helpers/lang.php");
+  require_once(ROOT_DIR . "/helpers/config.php");
   require_once(ROOT_DIR . "/helpers/utils.php");
 
   $auth = new uAuth();
@@ -26,6 +27,9 @@
   $action = uUtils::postString('action');
   $login = uUtils::postString('login');
   $pass = uUtils::postPass('pass');
+
+  $lang = (new uLang(uConfig::$lang))->getStrings();
+
   if (!$auth->isAuthenticated() || !$auth->isAdmin() || $auth->user->login == $login || empty($action) || empty($login)) {
     uUtils::exitWithError($lang["servererror"]);
   }
diff --git a/utils/import.php b/utils/import.php
index 36410ef..bcc7698 100755
--- a/utils/import.php
+++ b/utils/import.php
@@ -21,10 +21,13 @@ require_once(dirname(__DIR__) . "/helpers/auth.php");
 require_once(ROOT_DIR . "/helpers/track.php");
 require_once(ROOT_DIR . "/helpers/position.php");
 require_once(ROOT_DIR . "/helpers/utils.php");
-require_once(ROOT_DIR . "/lang.php");
+require_once(ROOT_DIR . "/helpers/config.php");
+require_once(ROOT_DIR . "/helpers/lang.php");
 
 $auth = new uAuth();
 
+$lang = (new uLang(uConfig::$lang))->getStrings();
+
 $uploadErrors = [];
 $uploadErrors[UPLOAD_ERR_INI_SIZE] = "The uploaded file exceeds the upload_max_filesize directive in php.ini";
 $uploadErrors[UPLOAD_ERR_FORM_SIZE] = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form";