If you normally would like to install a language pack for the Microsoft Office SharePoint Server 2007 service pack 1 product, you have to make sure you both install the retail version related language pack and the service pack related language pack. You can automate this process by slipstreaming the service pack language packs.
On Windows Server 2008 this slipstream process for Service Pack 1 does not work. Mauro Cardelli summed up a nice install list how to get it working:
Download the appropriate files.
- For MOSS, you will need the MOSS and WSS files. Remember there are specific 64bit versions
- On each of the download pages, change the language in the selector to the language pack you want, here are your download links:
Install the file. The install wizard will be in the language of the language pack… so know how to say 'Next' in that language!... or practice on the English version. Follow these steps:
- Install WSS Language Pack (don't run the MOSS Configuration Wizard)
- Install MOSS Language Pack (don't run the MOSS Configuration Wizard)
- Install WSS Language Pack SP1 (don't run the MOSS Configuration Wizard)
- Install MOSS Language Pack SP1
- Run the MOSS Configuration Wizard (choose to not disconnect from farm)
- Create a new site; you should see a drop down for Language which includes your newly installed language
- Go to the new site and learn how to say 'Site Actions, 'Edit Page' in a foreign language!
Also see a post on Microsoft TechNet Forums for more information.