localization: fix gettext

https://www.gnu.org/software/gettext/manual/html_node/Libraries.html

Related to rhbz#1087880

Signed-off-by: Jakub Filak <jfilak@redhat.com>
do not clear LANG env variable

Related to rhbz#1087880

Signed-off-by: Jakub Filak <jfilak@redhat.com>
a-a-a-core: fix localization

The strings of that file are not translated at all because the file was
not included in POTFILES.in

Related to rhbz#1087880

Signed-off-by: Jakub Filak <jfilak@redhat.com>