Store in constant CGU url

app/views/dossiers/etapes/etape_2/_individual.html.haml

@@ -36,7 +36,8 @@
         %p
           %label{ style: 'font-weight: normal;' }
             = f.check_box :autorisation_donnees
-             J'accepte <a href="https://tps.gitbooks.io/tps-documentation/content/conditions-generales-dutilisation.html" target="_blank">les CGU</a>.
+             J'accepte
+            = link_to "les CGU", CGU_URL, target: :blank
     .row
       .col-xs-5.col-xs-5
       .col-xs-2.col-xs-2

app/views/layouts/_footer.html.haml

@@ -7,6 +7,6 @@
     \-
     = link_to 'Statistiques', stats_path
     \-
-    = link_to 'CGU / Mentions légales', "https://tps.gitbooks.io/tps-documentation/content/conditions-generales-dutilisation.html"
+    = link_to 'CGU / Mentions légales', CGU_URL
     \-
     = link_to 'Contact', "mailto:"+t('dynamics.contact_email')

app/views/layouts/_new_footer.html.haml

@@ -21,7 +21,7 @@
           %li.footer-link
             = link_to "Statistiques", stats_path, :class => "footer-link"
           %li.footer-link
-            = link_to "CGU", "https://tps.gitbooks.io/tps-documentation/content/conditions-generales-dutilisation.html", :class => "footer-link", :target => "_blank"
+            = link_to "CGU", CGU_URL, :class => "footer-link", :target => "_blank"
 
       %li.footer-column
         %ul.footer-links

config/initializers/urls.rb

@@ -3,3 +3,5 @@ if Rails.env.production?
 else
   SIADEURL = 'https://staging.entreprise.api.gouv.fr'
 end
+
+CGU_URL = "https://tps.gitbooks.io/tps-documentation/content/conditions-generales-dutilisation.html"