[orca-list] Proble with replacing orca translation file

[Lukasz Golonka <wulfryk1 gmail com>]

Hello,  
From some time i'm working on improving polish translation of Orca. I've
already contacted leader of polish gnome translation team. I finished
translating, but i have problem testing it in practice. I made desired changes
in pl.po file, which i got from po directory in orca git repo. After
that i converted it to .mo format using msgftm -cv pl.po. I rename nevly
created messages.mo to orca.omo and replaced orginal file in
/usr/share/locale/pl/LC_MESSAGES. After this orca starts only in english.
I'm using Orca 3.22 oon arch linux. What i'm doing wrong? 
Greetings
Lukasz