[repo] normalize ValidationError on edited entity (closes #2509729) In CubicWeb, ValidationError.entity MUST be the eid of the involved entity, not the entity iteself (as done by yams).

bgcolor = '#000000'
stylesheets = ['%s/cubicweb.css' % datadir_url]
logo = '%s/logo.png' % datadir_url
lazy = lazystr('%(bgcolor)s')