Recently the .NET Framework 3.5 Language packages were released.

 You can get them by going to the following Microsoft Download center details page.

2.0 x86 -- http://www.microsoft.com/downloads/details.aspx?FamilyId=5F7F4632-C9C0-4E79-B269-C2AEE9D1962E&displaylang=en

2.0 x64 – http://www.microsoft.com/downloads/details.aspx?FamilyId=1CC39FFE-A2AA-4548-91B3-855A2DE99304&displaylang=en

2.0 ia64 – http://www.microsoft.com/downloads/details.aspx?FamilyId=DE4DFCCD-E75F-4C2F-9991-565A69AF9015&displaylang=en

3.0 -- http://www.microsoft.com/downloads/details.aspx?FamilyId=B3E05715-4D28-4C18-9A60-E26C0E3FFE1E&displaylang=en

3.5 -- http://www.microsoft.com/downloads/details.aspx?FamilyID=c78987b9-97f4-455f-bee7-f6bfa4ad774e&DisplayLang=en

 

After you browse to the page then you will need to choose a language.  When you choose that language click download to attempt to download and install that language package.