we're still lacking a migration script from the 2.2 to 2.3 Translatable database schema.
Just creating the new columns doesn't cut it unfortunately.
I've opened a ticket in http://open.silverstripe.com/ticket/3509
Any chance you want to help out with this? We usually create these migration scripts
as subclasses of Task, which are hooked into /dev/build for minimal friction (as we're
lacking a db migrations API at the moment).