Sorry Daniel, why do you think the lines are duplicated? From what I can see, you have probably selected both "pt" and "pt_br" languages in the filter and so every string that matches other filter settings (I guess 2.1 + enrol_database) is displayed twice - for each of the languages.
Google translation icon is displayed only at lines with the "pt" string. There is no mapping from "pt_br" to some Google language defined. If you know such mapping, please let me know.
About the google translate mapping, me and my friends are used to use the english -> portuguese translation and it is very good. I would like to have it on AMOS =)