USB disk creator is not working anymore in pt-br

[tenshimsm]

The usb-creator-gtk is not working anymore and keeps asking for password at the begining and at the end of the process.
It shows this message at the end of the process:

Um erro não previsto foi levantado:
'ascii' codec can't decode byte 0xc3 in position 26: ordinal not in range(128)

 I use Mint 12 in Brazilian Portuguese. I was working. I complained in askubuntu.com and roadmr (http://askubuntu.com/users/30589/roadmr) gave me this code that worked:

LANG=en_US.UTF-8 LANGUAGE=en_US usb-creator-gtk

BUT there are other people here that use this tool and they are not familiar with English.

We've tested it in Ubuntu 10.10, 11.04, 11.10, 12.04 and Mint 12.