myLinks[i].parent.graphicLayerOptions.updateLinkOptions = UpdateLinkOptions.KEEP_OVERRIDES; 

myLinks[i].parent.graphicLayerOptions.updateLinkOption = UpdateLinkOptions.KEEP_OVERRIDES; 

var myLinks = app.activeDocument.links;    
var avaiLangs = new Array("DE", "GB", "ES", "FR", "IT", "NL", "DK", "FI", "SE");  
//var avaiLangs = app.activeDocument.layers.everyItem().name; 
var newLang = prompt(avaiLangs.join(', '), "DE");  
 
for ( var i = 0; i < myLinks.length; i++ )    
{     
	if ( myLinks[i].parent.hasOwnProperty('graphicLayerOptions') )     
	{    
		myLinks[i].parent.graphicLayerOptions.updateLinkOption =  UpdateLinkOptions.KEEP_OVERRIDES;  
		checkLayers( myLinks[i], newLang);  
	}    
}  
alert("Sprachumstellung abgeschlossen!");  
 
function checkLayers( oneLink, newLang)  
{      
	for ( var n = 0; n < avaiLangs.length; n++ ) 
	{  
		var myObjectLayers = oneLink.parent.graphicLayerOptions.graphicLayers;    
		if ( myObjectLayers.itemByName(avaiLangs[n]).isValid)       
		{       
			myObjectLayers.itemByName(avaiLangs[n]).currentVisibility = false;  
		}  
	}  
	if ( myObjectLayers.itemByName(newLang).isValid) 
	{  
		myObjectLayers.itemByName(newLang).currentVisibility = true;  
	}  
}