fix management paths and highlight deletion

app/controllers/management/highlights_controller.rb

app/repositories/orient_db/highlight_repository.rb

app/views/management/highlights/_form_delete.html.erb

app/views/management/highlights/_form_new.html.erb

app/views/management/highlights/delete.html.erb

app/views/management/highlights/index.html.erb

app/views/management/highlights/new.html.erb

app/views/management/statistics/accesses.html.erb

app/views/management/statistics/collections.html.erb

app/views/management/statistics/downloads.html.erb

app/views/management/statistics/index.html.erb

app/views/management/statistics/users.html.erb

config/routes.rb