I have set up a test site and populated it with a few posts and images. I have done a bit of experimentation with posts and images in two languages and am starting to think about your original question:
The MLA Assistant page (the best feature of MLA by far) allows Bulk edit of media meta data. I would really love to have the ability to set bulk translation facility into the Assistant dashboard. Basically allow the selection of the language in the Quick Edit section and define all the usual media attributes.
I think the best way to continue our dialog would be by e-mail; I will summarize our progress here when we have a solution. I have unblocked India from the FTJ site and you should be able to access it. If you can go to the Contact Us page and give me your contact information I will send you my e-mail address:
I look forward to working with you on this effort. Thanks for you interest in the plugin.