cubicweb-skos #14170765 Configure relation widget if available [validation pending]

The relation widget is a handful way to edit a relation to a concept, but by default concepts are not properly (nor effectivly) displayed, because of its label mecanism complexity.

We could provide some views to make this much more user-friendly by default.

prioritynormal
typeenhancement
done in0.12.1
load left0.000
closed by#4c0a678154fc If it's installed, configure relation widget for display of concepts entities
patchIf it's installed, configure relation widget for display of concepts entities [applied]