When I translate a taxonomy to other languages, I cannot use it in autocomplete term-reference fields.
The auto complete field will show items only in the default language; if I try to fill the form from another language, nothing shows up in the field when I type.
It happens only when I use the autocomplete widget.
I am using Drupal 7.15.
Are you using 'Entity Translation' or the core 'Content translation'?
I think the sub-module Multilingual select (from Internationalization) should handle this for 'Content translation' (didn't test it, though).
But for Entity Translation, this doesn't seem to work (yet): see Entity translation and the Multilingual select i18n submodule interactions and Language aware edit form and autocomplete.
read this "Localize terms show always the default language" . but I personally suggest you don't translate terms, you can add both terms in you vocab . terms_data table impproved in Drupal7 and handle very much terms charmly.
