I've already knew that was possible to set environment variables defaults, but the way that I used, doesn't worked.
I had to use "locale -a" to discovery what locales I have installed:
root@bacula:/tmp# locale -a
C
C.UTF-8
POSIX
pt_BR.utf8
And insert the line in the beggining /etc/init.d/bacula-dir
export LC_ALL=C.UTF-8
Thanks Ana and Jarif