I forgot to reply to wp member that I checked "Create/update .po file when saving a lfm file".
Few times I tried compile after compile, only deleting .po file in between but sometimes .po file even wasn't being generated.
Regarding folder location question, my project has main folder (pas, lfm, lpr, ...files), lib folder (ppu, lfm (again ?), ...files), backup folder and (only one) folder for .po file.
Thanks