[mod] merge both views
[enh] send user_attending data to template
[mod] change title according to if on user page
[enh] same for button
[fix] form field name has changed
[enh] yay, button group used as a radio input \o/
[enh] put number of attendings per choice
[enh] refil form on event page with user uuid
[enh] select correct radio button on user event page
[enh] a user can modify it's answer choice
[fix] put yes as the default choice
[enh] don't display empty panels for empty sections
[enh] display when no one has answered an event
[enh] add warning on user attending event page