Oui, c'est possible de traduire plogger. Du moins l'interface principale. Mais les messages se trouvent tous a l'interieur du code dans le fichier gallery.php. Il suffit de l'editer et de traduire les messages de l' anglais au francais en faisant des rechercher dans le texte.
C'est moins pratique que les scripts qui utilisent des fichiers de langue externes.
Je l'ai fait partiellement ici htpp://alain.bergeon.free.fr/test/plogger
And you will need to change the text in dynamics.js file so that "show details" and "hide details" does not revert to english. (lines 17 and 36) If you change that text only in gallery.php, you will have the correct text for the initial view, but when dynamics.js runs it will revert to the English.
Don't forget to use escape characters for the for foreign characters!
I.E. é for the e in details...or you will end up with d?tails instead of détails in the text of the link to the hide and show details links.
You probably know that, but I wanted to put this info here so it was easily found by others when searching "french" in the forum. Not everyone will know to expect this nor how to change it.