I need to migrate a 6 language site from Joomla 1.012 to Joomla 1.5. Migrating one language is something I do myself in about 3 minutes. When I tried the Joomfish Migrator, language names appeared both from Joomla 1.0 and Joomla 1.5, so the database showed twice as many languages as there are. What was "portuguese" in the database needs to now show as "pt-BR", and so on with 4 other languages.
You can see a site to be migrated here:
[url removed, login to view]
There is also another site, but that has the same languages and situation exactly.
Please only bid if you have experience in migrating Joomla Multilingual sites