i18n logistration
Merge pull request #5770 from edx/renzo/logistration-i18n

i18n logistration
Set up basic enrollment infrastructure.
fixup! Set up basic enrollment infrastructure.
fixup! Set up basic enrollment infrastructure.
fixup! Set up basic enrollment infrastructure.
fixup! Set up basic enrollment infrastructure.
Add tests for the enrollment_interface
fixup! Add tests for the enrollment_interface