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Windows® 8 includes improvements to the way users add and configure input and display languages. The main changes are:
If you upgrade a Windows 7 PC that has one or more display language packs installed, those display languages will be absent from Windows 8. There is a compatibility message shown during setup to inform you of this change.
Figure 1: Upgrading with Language Packs
When you press the Confirm button, setup can continue. This kind of notification is provided to help ensure that you do not find yourself unexpectedly without the language support you expect.
Read more: http://blogs.msdn.com/b/olivnie/archive/2013/04/14/language.aspx