If you want to use additional language to work with in Windows Server 2008 R2 SP1, you need to use the new language pack ISO file to install them.
Here you can download the ISO, 2.73GB.
To silently install the languages use the following command;
lpksetup.exe /i ro-ro ru-ru es-es sv-se tr-tr ca-es /r /p /s D:
where D: is your source location. Offcourse you can add more languages to the line.
Can’t get the solution to work? Contact me and let me do the trick.