diff --git a/migrations/01_initial.php b/migrations/01_initial.php
index 95fa09fa11ea44decc38a104a8107dace3f3314d..09c845cc107653e3e1dae0dea3720a91e51341dd 100644
--- a/migrations/01_initial.php
+++ b/migrations/01_initial.php
@@ -16,15 +16,15 @@
 
 class Initial extends Migration
 {
-    
+
     private static $cronjob = array(
             'filename' => 'public/plugins_packages/data-quest/TandemPlugin/TandemPluginCronjob.class.php',
             'class' => 'TandemPluginCronjob',
             'priority' => 'normal',
             'execution_interval' => ['3', '0'] //at 3:00 every day
     );
-    
-    
+
+
     public function __construct()
     {
         $this->cronjob_md5 = md5(
@@ -33,18 +33,18 @@ class Initial extends Migration
             self::$cronjob['priority'] .
             self::$cronjob['execution_interval']
         );
-        
+
         parent::__construct();
     }
-    
-    
+
+
     public function up()
     {
         $db = DBManager::get();
-        
-        
+
+
         //Create tables:
-        
+
         $db->exec(
             "CREATE TABLE IF NOT EXISTS tandem_languages (
                 id VARCHAR(3) PRIMARY KEY NOT NULL,
@@ -55,7 +55,7 @@ class Initial extends Migration
                 chdate BIGINT(20) UNSIGNED NOT NULL DEFAULT '0'
             );"
         );
-        
+
         $db->exec(
             "CREATE TABLE IF NOT EXISTS tandem_user_mother_languages (
                 id VARCHAR(32) PRIMARY KEY NOT NULL,
@@ -69,7 +69,7 @@ class Initial extends Migration
                 INDEX(language_id)
             );"
         );
-        
+
         $db->exec(
             "CREATE TABLE IF NOT EXISTS tandem_profiles (
                 id VARCHAR(32) PRIMARY KEY NOT NULL,
@@ -88,7 +88,7 @@ class Initial extends Migration
                 INDEX(proof_of_attendance)
             );"
         );
-        
+
         $db->exec(
             "CREATE TABLE IF NOT EXISTS tandem_pairs (
                 id VARCHAR(32) PRIMARY KEY NOT NULL,
@@ -101,10 +101,10 @@ class Initial extends Migration
                 chdate BIGINT(20) UNSIGNED NOT NULL DEFAULT '0'
             );"
         );
-        
-        
+
+
         //Create configuration fields, if they don't exist yet:
-        
+
         $gender_search_enabled = ConfigEntry::findByField('TANDEMPLUGIN_GENDER_SEARCH_ENABLED');
         if(!$gender_search_enabled) {
             $gender_search_enabled = new ConfigEntry();
@@ -114,7 +114,7 @@ class Initial extends Migration
             $gender_search_enabled->section = 'tandemplugin';
             $gender_search_enabled->store();
         }
-        
+
         $delete_old_period = ConfigEntry::findByField('TANDEMPLUGIN_DELETE_OLD_PERIOD');
         if(!$delete_old_period) {
             $delete_old_period = new ConfigEntry();
@@ -124,25 +124,25 @@ class Initial extends Migration
             $delete_old_period->section = 'tandemplugin';
             $delete_old_period->store();
         }
-        
-        
-        
+
+
+
         //Add cronjob:
-        
+
         if($this->cronjob_md5) {
             $db = DBManager::get();
-            
+
             $db->exec(
                 "INSERT INTO `cronjobs_tasks`
-                (`task_id`, `filename`, `class`, `active`) 
+                (`task_id`, `filename`, `class`, `active`)
                 VALUES
                 ('".$this->cronjob_md5."', '"
                 .self::$cronjob['filename']."', '"
                 .self::$cronjob['class']."', '1')"
             );
-            
+
             $schedule_id = md5(uniqid($this->cronjob_md5, true));
-            
+
             $db->exec(
                 "INSERT INTO `cronjobs_schedules`
                 (`schedule_id`, `task_id`, `active`, `parameters`, `priority`,
@@ -154,60 +154,60 @@ class Initial extends Migration
                 ."', '" . self::$cronjob['execution_interval'][1]
                 ."', UNIX_TIMESTAMP(), UNIX_TIMESTAMP(), NULL)"
             );
-            
+
             $db = null;
         }
-        
-        
+
+
         //close DB connection:
         $db = null;
-        
+
     }
-    
-    
+
+
     public function down()
     {
         $db = DBManager::get();
-        
+
         //Drop tables:
         $db->exec('DROP TABLE IF EXISTS tandem_languages;');
         $db->exec('DROP TABLE IF EXISTS tandem_user_mother_languages;');
         $db->exec('DROP TABLE IF EXISTS tandem_profiles;');
         $db->exec('DROP TABLE IF EXISTS tandem_pairs;');
-        
+
         //Delete configuration fields:
-        
+
         $gender_search_enabled = ConfigEntry::findByField('TANDEMPLUGIN_GENDER_SEARCH_ENABLED');
         if($gender_search_enabled) {
             foreach($gender_search_enabled as $gse) {
                 $gse->delete();
             }
         }
-        
+
         $delete_old_period = ConfigEntry::findByField('TANDEMPLUGIN_DELETE_OLD_PERIOD');
         if($delete_old_period) {
             foreach($delete_old_period as $dop) {
                 $dop->delete();
             }
         }
-        
+
         //Delete cronjob:
-        
+
         if($this->cronjob_md5) {
             $db = DBManager::get();
-            
+
             $db->exec(
                 "DELETE FROM `cronjobs_tasks` WHERE task_id = '".$this->cronjob_md5."'"
             );
-            
+
             $db->exec(
                 "DELETE FROM `cronjobs_schedules` WHERE task_id = '".$this->cronjob_md5."'"
             );
-            
+
             $db = null;
         }
-        
-        
+
+
         //close DB connection:
         $db = null;
     }
diff --git a/migrations/02_add_data.php b/migrations/02_add_data.php
index ef8aff0e4662a30528a726847ff34a75f7cd61eb..367b99dcd078f05fbfc16dcc3181ffd760685953 100644
--- a/migrations/02_add_data.php
+++ b/migrations/02_add_data.php
@@ -16,7 +16,7 @@
 
 class AddData extends Migration
 {
-    
+
     private $languages = [
         ["ara", "Arabic", "Arabisch"],
         ["chi", "Chinese", "Chinesisch"],
@@ -39,19 +39,19 @@ class AddData extends Migration
         ["spa", "Spanish", "Spanisch"],
         ["tur", "Turkish", "Türkisch"]
     ];
-    
-    
-    
-    
+
+
+
+
     public function up()
     {
         $db = DBManager::get();
-        
+
         //insert languages:
         $sql = "INSERT INTO tandem_languages
             (id, name, name_eng, name_ger, mkdate, chdate)
             VALUES ";
-            
+
         $values = [];
         foreach($this->languages as $language) {
             $values[] = '(' 
@@ -61,25 +61,25 @@ class AddData extends Migration
                 . $db->quote($language[2]) . ','
                 . 'UNIX_TIMESTAMP(), UNIX_TIMESTAMP())';
         }
-        
+
         $sql .= implode(',', $values);
-        
+
         $sql .= ';';
-        
+
         $db->exec($sql);
-        
+
         //close DB connection:
         $db = null;
-        
+
     }
-    
-    
+
+
     public function down()
     {
         $db = DBManager::get();
-        
+
         $db->exec('DELETE FROM tandem_languages;');
-        
+
         //close DB connection:
         $db = null;
     }
diff --git a/migrations/04_add_terminated_tandem_pairs.php b/migrations/04_add_terminated_tandem_pairs.php
index 7031864a98df88d3f2058a52d07c44a8fbd33770..8646fd863fd6d9ed9a4ec20c40e3cfc44d47a547 100644
--- a/migrations/04_add_terminated_tandem_pairs.php
+++ b/migrations/04_add_terminated_tandem_pairs.php
@@ -16,14 +16,14 @@
 
 class AddTerminatedTandemPairs extends Migration
 {
-    
+
     public function up()
     {
         $db = DBManager::get();
-        
-        
+
+
         //Create table:
-        
+
         $db->exec(
             "CREATE TABLE IF NOT EXISTS terminated_tandem_pairs (
                 id VARCHAR(32) PRIMARY KEY NOT NULL,
@@ -41,20 +41,20 @@ class AddTerminatedTandemPairs extends Migration
                 chdate BIGINT(20) UNSIGNED NOT NULL DEFAULT '0'
             );"
         );
-        
+
         //close DB connection:
         $db = null;
-        
+
     }
-    
-    
+
+
     public function down()
     {
         $db = DBManager::get();
-        
+
         //Drop table:
         $db->exec('DROP TABLE IF EXISTS terminated_tandem_pairs;');
-        
+
         //close DB connection:
         $db = null;
     }
diff --git a/plugin.manifest b/plugin.manifest
index 73d8fa19216c2350e7268bcb725885e4edf03dbe..5683bf59c77d8bf24877386943dd2e70153ef191 100644
--- a/plugin.manifest
+++ b/plugin.manifest
@@ -1,6 +1,7 @@
 pluginname=TandemPlugin
 pluginclassname=TandemPlugin
 origin=data-quest
-version=0.9.1
+version=1.0.0
 description=Dieses Plugin ermöglicht es, Sprachtandems innerhalb der Stud.IP Platform zu bilden.
-studipMinVersion=4.0
+studipMinVersion=4.1.99
+studipMaxVersion=4.99.99