[javascript] fix AJAX user preference validation
- use $elt.val() instead of $elt.attr('value')
- fix radio button handling
#! /bin/sh -e#if [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0