I use Polish pl_PL locale for my WP 2.7. Just installed the Nextgen gallery and uploaded the ngallery-pl_PL.mo file with its Polish translation to nextgen-gallery/lang folder but the entire nextgen admin panel remains in English. I tried to do the same with a German translation and changed my wp-config.php to de_DE and it worked fine. Just the Polish translation doesn't work. Maybe I did something wrong?