I'm trying to translate the Register's module in French, but it doesn't work.
I 've put fr.po and fr.mo files in gallery2\modules\register\po
What can I do?
gallery 2 has a copy of the .mo files in g2data. i guess it will pick up your new .mo file when you deactivate and activate again the register module.
or maybe that only happens when installing a module. so you'd first have to uninstall the register module, then install it again.
(when a plugin (module or theme) is installed, g2 copies the plugin's .mo files to g2's g2data folder)