Silverlight Runtime and Developer Runtime skus are multilingual packages, but Silverlight Tools Beta2 has different language skus.

Silverlight Tools Beta2 Chainer has multilingual Developer Runtime, Japanese Silverlight SDK, and Japanese Silverlight Tools.  

check them out at http://www.microsoft.com/downloads/details.aspx?FamilyId=50A9EC01-267B-4521-B7D7-C0DBA8866434&displaylang=ja.

Silverlight Tools Beta 2 for Visual Studio 2008 includes:

  • Visual Basic and C# Project templates
  • Intellisense and code generators for XAML
  • Debugging of Silverlight applications
  • Web reference support
  • WCF Templates
  • Team Build and command line build support
  • Integration with Expression Blend
  • Enhanced Setup with upgrade support