validate track name, render instead of redirect for campaigns, fix view for new sponsor

app/views/admin/sponsors/_form.html.haml

@@ -1,9 +1,9 @@
 .row
   .col-md-12
     .page-header
-      -if @sponsor.new_record?
-        New
       %h1
+        -if @sponsor.new_record?
+          New
         Sponsor
         = @sponsor.name
 .row
@@ -16,4 +16,4 @@
       = f.input :website_url
       = f.input :sponsorship_level, collection: @conference.sponsorship_levels
       %p.text-right
-        = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }
+        = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }