Here is the reg keys for all languages except Chinese Simplified. The CIU doesn't support. I hope that solve the problem with other languages. ;)

Fabioddq your key is FLT pirated version.

my steam
[HKEY_CURRENT_USER\Software\Valve\Steam\Apps\228300]
"Installed"=dword:00000001

I just implement all languages in the regs posted in the first page. Change according to your needs.