The Microsoft Dynamics GP 10.0 Spanish Latin-American and French-Canadian environments are now available for SP5. This should mean that the same environments will be coming for GP 2010 SP1 very soon.
Microsoft Dynamics GP 10.0 Spanish Latin-American and French-Canadian environments (Service Pack 5)
Install, Upgrade & AdminGP 2010GP 10
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.