cubicweb #1381320 [user prefs] impossible to update some prefs [deprecated]

for instance I want to set prev/next links to the top ... (should be the default btw)

when I click on "valider" I get one nasty "veuillez corriger les erreurs ci-dessous"

prioritynormal
typebug
done in3.15.2
load0.000
load left0.000
closed by<not specified>