Link is added to the sidebar title to directly go to the region's organisations

Refs #123

app/views/events/show.html.haml

@@ -17,9 +17,10 @@
 - if controller.controller_name == 'events' && controller.action_name == 'show'
   %aside#orga-list
     - if @event.region.present? && @event.region.orgas.present?
-      %h1
-        %em.fa.fa-users
-        = t '.orga-list'
+      %h1{ title: @event.region }
+        = link_to orgas_path region: @event.region do
+          %em.fa.fa-users
+          = t '.orga-list'
       %ul.fa-ul
         - @event.region.orgas.select(&:active).each do |orga|
           %li