Seaside and Pharo 6: Problem with Umlauts?

Hello Seasiders,

I just managed to load Seaside  into a Pharo 6.0 image running on MacOS 
Sierra unsing

Metacello new
  configuration:'Seaside3';
  repository: 
'http://www.smalltalkhub.com/mc/Seaside/MetacelloConfigurations/main';
  version: #stable;
  load.

Beside starting the ServerAdaptor manually via 
        ZnZincServerAdaptor startOn: 8081.
because of the missing class NewListModel

I had to change 
        WAResponse>>writeStatusOn:
because the used stream does not support
        #nextPutAll: with a Character as argument.

So I changeed in #writeAStatusOn:
        nextPut: $ ;
to 
        nextPut: $  charCode;
in two places.

Furthermore the used stream does not support 
        #crlf
so I added it to ZdcAbstractSocketStream.

Now I can open the examples etc.

That was easy :-)

Now I tried to deploy an old Seaside App written by me and got "cannot 
parse response" error in my webbrowser (no debugger in the VM).
I tracked it down to the use of Umlauts (äüö) in the rendered pages.

As a simple demo of this problem I changed the WACounter example. If I add 
a german Umlaut to the "++" or "--" label I get a "cannot parse response" 
in my browser upon rendering the WACounter expample.

Is there something wrong with my setup or is it a bug? 
Many thanks for any hints.

Happy coding,

Dietmar

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