diff --git a/manifest.php b/manifest.php
index d8a88512..dd70f221 100755
--- a/manifest.php
+++ b/manifest.php
@@ -35,7 +35,7 @@
 	'label' => 'LTI library',
     'description' => 'TAO LTI library and helpers',
     'license' => 'GPL-2.0',
-    'version' => '3.2.3',
+    'version' => '3.2.4',
 	'author' => 'Open Assessment Technologies SA',
 	'requires' => array(
 	   'tao' => '>=10.8.0'
diff --git a/models/classes/class.LtiUser.php b/models/classes/class.LtiUser.php
index c559bdcb..5d3467d4 100755
--- a/models/classes/class.LtiUser.php
+++ b/models/classes/class.LtiUser.php
@@ -1,5 +1,4 @@
 <?php
-use oat\taoLti\models\classes\LtiVariableMissingException;
 /**  
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -19,6 +18,7 @@
  *               
  * 
  */
+use oat\taoLti\models\classes\LtiVariableMissingException;
 
 /**
  * Authentication adapter interface to be implemented by authentication methodes
@@ -29,58 +29,70 @@
  
  */
 class taoLti_models_classes_LtiUser
-	extends common_user_User
+    extends common_user_User
 {
     /**
      * Data with which this session was launched
      * @var taoLti_models_classes_LtiLaunchData
      */
-	private $ltiLaunchData;
+    private $ltiLaunchData;
+
+    /**
+     * Local represenation of user
+     * @var core_kernel_classes_Resource
+     */
+    private $userUri;
+
+    /**
+     * Cache of the current user's lti roles
+     * @var array
+     */
+    protected $roles;
+
+    /**
+     * Currently used UI languages.
+     *
+     * @var array
+     */
+    protected $uiLanguage;
+
+    public function __construct(taoLti_models_classes_LtiLaunchData $ltiLaunchData) {
+        $this->ltiLaunchData = $ltiLaunchData;
+        $this->userUri = taoLti_models_classes_LtiService::singleton()->findOrSpawnUser($ltiLaunchData)->getUri();
+        $this->roles = $this->determinTaoRoles();
+    }
+
+    /**
+     * @return taoLti_models_classes_LtiLaunchData
+     */
+    public function getLaunchData() {
+        return $this->ltiLaunchData;
+    }
 
-	/**
-	 * Local represenation of user
-	 * @var core_kernel_classes_Resource
-	 */
-	private $userUri;
-	
-	/**
-	 * Cache of the current user's lti roles
-	 * @var array
-	 */
-	protected $roles;
-	
-	public function __construct(taoLti_models_classes_LtiLaunchData $ltiLaunchData) {
-	    $this->ltiLaunchData = $ltiLaunchData;
-	    $this->userUri = taoLti_models_classes_LtiService::singleton()->findOrSpawnUser($ltiLaunchData)->getUri();
-	    $this->roles = $this->determinTaoRoles();
-	}
-	
-	/**
-	 * 
-	 * @return taoLti_models_classes_LtiLaunchData
-	 */
-	public function getLaunchData() {
-	    return $this->ltiLaunchData;
-	}
-	
-	/**
-	 * (non-PHPdoc)
-	 * @see common_user_User::getIdentifier()
-	 */
+    /**
+     * (non-PHPdoc)
+     * @see common_user_User::getIdentifier()
+     */
     public function getIdentifier() {
         return $this->userUri;
     }
-    
-	public function getPropertyValues($property) {
-	    $returnValue = null;
-	    switch ($property) {
-	    	case PROPERTY_USER_DEFLG :
-	    	case PROPERTY_USER_UILG :
-	    	    $returnValue = array($this->getLanguage());
-	    	    break;
-	    	case PROPERTY_USER_ROLES :
-	    	    $returnValue = $this->roles;
-	    	    break;
+
+    /**
+     * (non-PHPdoc)
+     * @see common_user_User::getPropertyValues()
+     */
+    public function getPropertyValues($property) {
+        $returnValue = null;
+        switch ($property) {
+            case PROPERTY_USER_DEFLG :
+                $returnValue = array(DEFAULT_LANG);
+                break;
+            case PROPERTY_USER_UILG :
+                $returnValue = array($this->getUiLanguage());
+                break;
+            case PROPERTY_USER_ROLES :
+                $returnValue = $this->roles;
+                break;
             case PROPERTY_USER_FIRSTNAME :
                 try {
                     $returnValue = [$this->getLaunchData()->getUserGivenName()];
@@ -95,43 +107,54 @@ public function getPropertyValues($property) {
                     $returnValue = '';
                 }
                 break;
-	    	default:
-	    	    common_Logger::d('Unkown property '.$property.' requested from '.__CLASS__);
-	    	    $returnValue = array();
-	    }
-	    return $returnValue;
-	}
-	
-	public function refresh() {
-        // nothing to do	    
-	}
-	
-	private function getLanguage() {
-	    $returnValue = DEFAULT_LANG;
-	    if ($this->getLaunchData()->hasLaunchLanguage()) {
-	        // maping not implemented yet
-            $returnValue = taoLti_models_classes_LtiUtils::mapCode2InterfaceLanguage($this->getLaunchData()->getLaunchLanguage());
-	    }
-	    return $returnValue;
-	}
-	
-	private function determinTaoRoles() {
+            default:
+                common_Logger::d('Unkown property '.$property.' requested from '.__CLASS__);
+                $returnValue = array();
+        }
+        return $returnValue;
+    }
+
+    /**
+     * (non-PHPdoc)
+     * @see common_user_User::refresh()
+     */
+    public function refresh() {
+        // nothing to do
+    }
+
+    /**
+     * Returns the validated launch interface language.
+     *
+     * @return string
+     */
+    private function getUiLanguage() {
+        if (is_null($this->uiLanguage)) {
+            if ($this->getLaunchData()->hasLaunchLanguage()) {
+                $launchLanguage = $this->getLaunchData()->getLaunchLanguage();
+                $this->uiLanguage = taoLti_models_classes_LtiUtils::mapCode2InterfaceLanguage($launchLanguage);
+            } else {
+                $this->uiLanguage = DEFAULT_LANG;
+            }
+        }
+        return $this->uiLanguage;
+    }
+
+    private function determinTaoRoles() {
         $roles = array();
         if ($this->getLaunchData()->hasVariable(taoLti_models_classes_LtiLaunchData::ROLES)) {
             foreach ($this->getLaunchData()->getUserRoles() as $role) {
                 $taoRole = taoLti_models_classes_LtiUtils::mapLTIRole2TaoRole($role);
                 if (!is_null($taoRole)) {
                     $roles[] = $taoRole;
-					foreach (core_kernel_users_Service::singleton()->getIncludedRoles(new core_kernel_classes_Resource($taoRole)) as $includedRole) {
-						$roles[] = $includedRole->getUri();
-					}
+                    foreach (core_kernel_users_Service::singleton()->getIncludedRoles(new core_kernel_classes_Resource($taoRole)) as $includedRole) {
+                        $roles[] = $includedRole->getUri();
+                    }
                 }
             }
-			$roles = array_unique($roles);
+            $roles = array_unique($roles);
         } else {
             return array(INSTANCE_ROLE_LTI_BASE);
         }
-	    return $roles;
-	}
-	
-}
\ No newline at end of file
+        return $roles;
+    }
+}
diff --git a/models/classes/class.LtiUtils.php b/models/classes/class.LtiUtils.php
index a99baec6..0fd1e144 100755
--- a/models/classes/class.LtiUtils.php
+++ b/models/classes/class.LtiUtils.php
@@ -95,11 +95,20 @@ public static function mapTaoRole2LTIRoles($roleUri)
      * not yet implemented, will always use default
      * 
      * @param string $code
+     *
      * @return string
      */
     public static function mapCode2InterfaceLanguage($code)
     {
-        $returnValue = DEFAULT_LANG;
-        return $returnValue;
+        if (!empty($code)) {
+            $languageService = tao_models_classes_LanguageService::singleton();
+            $usage = new core_kernel_classes_Resource(INSTANCE_LANGUAGE_USAGE_GUI);
+            if ($languageService->isLanguageAvailable($code, $usage)) {
+                return $code;
+            }
+            \common_Logger::d('[Fallback] The provided launch language is unavailable: ' . $code);
+        }
+
+        return DEFAULT_LANG;
     }
-}
\ No newline at end of file
+}
diff --git a/models/classes/class.TaoLtiSession.php b/models/classes/class.TaoLtiSession.php
index 8b49b9eb..ecd9ef7b 100755
--- a/models/classes/class.TaoLtiSession.php
+++ b/models/classes/class.TaoLtiSession.php
@@ -106,29 +106,4 @@ public function getLtiLinkResource()
 		}
 		return $this->ltiLink;
 	}
-
-    /**
-     * Returns the interface language.
-     *
-     * Priority: Launcher passed language > Parent language determination
-     *
-     * @return string
-     */
-    public function getInterfaceLanguage()
-    {
-
-        if($this->getLaunchData()->hasLaunchLanguage()){
-            $launchLanguage = (string)$this->getLaunchData()->getLaunchLanguage();
-            if (!empty($launchLanguage)) {
-                $languageService = tao_models_classes_LanguageService::singleton();
-                $usage = new core_kernel_classes_Resource(INSTANCE_LANGUAGE_USAGE_GUI);
-                if ($languageService->isLanguageAvailable($launchLanguage, $usage)) {
-                    return $launchLanguage;
-                }
-                \common_Logger::d('[Fallback] Language is unavailable: ' . $launchLanguage);
-            }
-        }
-        return parent::getInterfaceLanguage();
-    }
-
-}
\ No newline at end of file
+}
diff --git a/scripts/update/class.Updater.php b/scripts/update/class.Updater.php
index 50c675bf..3fbab2b0 100755
--- a/scripts/update/class.Updater.php
+++ b/scripts/update/class.Updater.php
@@ -74,6 +74,6 @@ public function update($initialVersion)
             $this->setVersion('2.1.0');
         }
 
-        $this->skip('2.1.0', '3.2.3');
+        $this->skip('2.1.0', '3.2.4');
     }
 }