<%= link_to new_site_mapping_path(@site), class: 'btn btn-default' do %>
  <i class="glyphicon glyphicon-plus"></i> Add mapping
<% end %>

<%= link_to new_site_mapping_path(@site), class: 'btn btn-default' do %>
  <i class="glyphicon glyphicon-plus"></i> Add mappings
<% end %>

Update add mapping copy to be plural
Update add mapping copy to be plural
