cubicweb-conference #968753 make it clear that a talk is in state "draft" [resolved]

as long as a talk is in state "draft", display a red box that explains the talk needs to be submitted before being taken into consideration by the reviewers.

prioritynormal
typeenhancement
done in0.6.0
load0.100
load left0.000
closed by#39df11022b55 [views] make it clear that a talk requires action (closes #968753)