Change primary language in online Windows 8.1

Question

Hi all, 
is there a way to change windows 8.1´s primary language via script?
After deploying o standard en-us image at every site of our company, we add site-specific language packs using lpksetup.exe commandline.
On Windows 7, we were able to change default language (which seems to be called primary language in Windows 8.1) using and xml file as described here: http://msdn.microsoft.com/en-ie/goglobal/bb964650%28en-us%29.aspx
With Windows 8.1 this doesn´t seem to work anymore - does anybody know another way of doing it? 
Many thanks in advance, 
Andreas

Answer 1

Hi, 
thanks for your answers but that´s not what i was looking for. 
My Scenario is to deploy Windows 8.1 in a multinationaly environment. I had planned to have only one english image (no language packs at all) for all clients.
Depending on the clients site, i´d add the needed language packs afterwards via commandline (lpksetup.exe) and set the default UI Language and Inputlanguage for the machine. Adding the languagepacks (using lpksetup.exe or dism.exe) does add the package to
the local store, nut I still need do do these steps manually: 
1. Add the language in the control panel applet to make it visible in the list of available languages (at least windows knows that the files are there) 
2. Make one language the primary one
3. Choose an input language
4. Copy those settings for all users
It can´t be the only way to do offline servicing and redeploy the windows image to all distribution points everytime we need a new language for a new site.
Also, it´s not an option to let the user do the work, clicking through control panel applets. 
Is there a way, to do Steps 1 to 4 via commandline in a running Windows installation (DISM doesn´t support any online installation)? 
Best regards,
Andreas