Added check to prevent adding a module more than once

Few small bugfixes

root/language/de/mods/portal/portal_latest_bots_module.php

@@ -33,7 +33,8 @@ if (empty($lang) || !is_array($lang))
 // in a url you again do not need to specify an order e.g., 'Click %sHERE%s' is fine
 $lang = array_merge($lang, array(
 	'LATEST_BOTS'			=> 'Letzte Bots',
-	'LAST_VISITED_BOTS'		=> 'Die letzten %s Bots',
+	'LAST_VISITED_BOTS'		=> 'Die letzten Bots',
+	'LAST_VISITED_BOTS_CNT'	=> 'Die letzten %s Bots',
 	
 	// ACP
 	'ACP_PORTAL_BOTS_SETTINGS'					=> 'Einstellungen für Bot-Besuche',