I have a similar problem. I have a site that is in English and French. I've recently upgraded from 2.3.0-RC2 to 2.3.2-RC2. I followed the instructions and ran the Migration script at the end of the upgrade. Admin works fine, and the English version of the site is intact. However...

I can see that within the database that all the SiteTree_lang tables have been obsoleted and I can no longer use the ?lang=<lang> to access the translated fields. No problem, I can set the locale and change the code to use ?locale=<locale> ( ?locale=fr_CA ). But the translated site no longer exists in the cms. In the database I can see that the fields are still there so my content isn't entirely missing. How do I reconnect all the French fields ( <field>_fr ) back into the cms? Is there a tanslatable table to map the FR locale back to those orphaned fields?

thanks in advance!