Yes,
First I set my WPLANG on german, then I opened the de_DE.po file in the atelier/languages folder with Poedit, changed some translations and generated the .mo file. I uploaded the files in the same folder.
Now some text is translated and other text is not. For example the “wishlist is empty” text is translated, but the “cart is empty” text remains in english (I changed both in the .po)
Do I have to change something else to activate the full translation?