Thanks for everything 
From now on, I don’t have migrations left, and I could update all system packages from the web interface.
I managed to update everything left, I don’t know why, it worked when I clicked on “update all applications” and not separately.
The one last thing is my Yunohost version still says :
Will it come to normal some day ?
Nice that everything is in order now!
My French is not good enough to fit the text in the image to something computer related 
What’s not normal about this o.O
Nevermind, I was very confident that the version number should be 4.xxx, don’t know why.
So, it’s solved ! 
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