replace deprecated disable_with option

app/views/invitations/new.html.haml

@@ -26,4 +26,4 @@
     
     .control-group
       .controls
-        = submit_tag t('.send_an_invitation'), :class => 'btn btn-primary creation', :disable_with => t('.sending_invitation')
+        = submit_tag t('.send_an_invitation'), class: 'btn btn-primary creation', data: {disable_with: t('.sending_invitation')}

app/views/registrations/new.html.erb

@@ -73,7 +73,7 @@
                 <%= t('.terms', terms_link: link_to(t('.terms_link'), terms_path, target: "_blank")).html_safe %>
               </div>
             <% end %>
-            <%= f.submit t('.continue'), :class => "new-btn", :disable_with => t('.submitting') %>
+            <%= f.submit t('.continue'), class: "new-btn", data: {disable_with: t('.submitting')} %>
         <% end %>
       </div>
     </div>