The RIS server assumes that you have files in a language path which is the same as the RIS server's OS language. To provision a Windows OS which is not the same as the RIS server's OS language, you need to do some additional configuration.
Workaround: Copy the other language's files to the English path.
Go to the directory in which the OS Chooser files live.
For example:
% cd RemoteInstall\OSChooser
Copy the files from the language directory to an English directory.
For example:
% copy -r Japanese English
This creates a directory RemoteInstall\OSChooser\English that contains the install screens in the native language. When the RIS software looks into the default English path, it will display the non-English OS Chooser screens during install.
The above workaround is for English RIS server to deploy a non-English Windows image. When you use a non-English RIS server to deploy a English Windows image, type:
% copy -r English <language>