Bonjour,
Je suis français aussi and the exact same thing happened to me. Maybe the Pocketbook 602 doesn't like French people...
Now I just don't use bookmarks any more, which is not the best solution I admit, but at least it is a reason I won't have to smash my PB602 against the wall.
I already reported that bug in the bug report topic.
https://www.mobileread.com/forums/sho...pocketbook+602
I suggest you do the same so that issue will have more chance to be looked into.