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Each customer profile type gets a MENU_LOCAL_TASK under user/%user/addressbook/ in the hook_menu(). Translation of the titles on these pages are disable. (Example custom profile types from commerce kickstart; "Billing information" and "Shipping information")
It is probably caused by the "'title callback' => FALSE". Is there any reason to disable the titles from being passed though t()?
I have tried to remove that line from commerce_addressbook.module and I haven't hit any problems yet. It fixes the translation problem.