thanks for the update! To test it you could open the po-file with poedit, then save the po-file in poedit as "addlocale.po". This will create a new file "addlocale.mo". Copy this mo-file into "/usr/share/locale/fr/LC_MESSAGES/". Then, on a french localized system, start addlocale and you should see your new translations for the window messages in addlocale.
Once you are happy with the french translation please send me the addlocale.po file so it can be included into the addlocale srpm.
thanks again and have a nice day!