[Libreoffice] Two-stage install on Windows

Hi,

I was working on https://bugs.freedesktop.org/show_bug.cgi?id=32335
(Under Traditional Chinese environment, the installation process
showed bizarre characters) which is still unresolved but at least I
learned that the problem was not in LibreOffice source but in the
official build environment. Anyway, I started to think about why we
use two-stage install on Windows. Why don't we simply extract the MSI
installer (e.g. with NSIS silent install) to a temp folder and start
setup.exe without a -lang switch. setup.exe can find out the correct
language itself. We could get rid of NSIS limitations (non-Unicode),
and we would not put installer files to the average user's desktop.
Systems administrators can still extract the MSI installer with the
/EXTRACTONLY=ON switch of NSIS.

Do you have arguments for the current two-stage install method?

Andras