You can now download the localized version of 4.0 SP1. It supports the following 32 countries/regions:

Austria, Australia, Belgium, Brazil, Canada, China, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Iceland, India, Italy, Ireland, Latvia, Lithuania, Malaysia, Mexico, Netherlands, New Zealand, Poland, Russia, Singapore, South Africa, Spain, Switzerland, United Kingdom, United States and Turkey.

You can download it from Partner Source:
https://mbs.microsoft.com/partnersource/downloads/servicepack/ax40sp1_download.htm

And from Customer Source:
https://mbs.microsoft.com/customersource/support/downloads/servicepacks/ax40sp1_download.htm