hmm, I'm using localzier not i18n... it's another module for multi language sites.

Here is an example how localizer stores its translations:
(`tid`, `object_key`, `object_name`, `object_field`, `translation`, `language`)
(25, 'user_mail_welcome_subject', 'variable', 'value', 'Account details for !username at !site', 'en'),

I'm sure that I can put in something from uc_attributes uc_attributes options. But the object_key remains a secret for me. thx!