"liseuse" - I can't figure out how to pronounce the word correctly - assuming correctly somehow does away with the similarity to the word "lice".....
I always just call mine my ebook reader, or ebook.
If we need a formal, agreed upon term, how about calling them what they were originally introduced to most of us as - the PADD.
Because, let's be honest here - how many of us were envious of the Star Trek reading devices, and have compared our ebook readers to the awesome Personal Access Display Devices shown so frequently in Star Trek?
I know I have. Many times. Many many many times.
So, my vote is to call them PADDs - since ebook reader doesn't seem popular.