anchor.diff:        <%= f.submit t('buttons.add'), :class => 'btn btn-primary' %>
       <% end %>
     </div>
  -  <div class="col-xs-12 col-sm-6">
  -    <%= render @plaque.main_photo, :large => true if @plaque.main_photo %>
  -  </div>
  +  <% if @plaque.main_photo %>
  +    <div class="col-xs-12 col-sm-6">
  +      <%= render @plaque.main_photo, :large => true %>
  +    </div>
  +  <% end %>
   </div>
   
   <script type="text/javascript">
  
positive.code: <% content_for(:page_title) {t '.page_title', :plaque => @plaque.id.to_s } %>
  <% content_for(:title) {@plaque.inscription_preferably_in_english}%>
  <%= render 'plaques/edit_bar', :plaque => @plaque %>
  
  <style>
  
negative.code:       <fieldset class="form-group">
          <%= t('.at') + ' ' + @personal_connection.full_address if @personal_connection.full_address %>
        </fieldset>
        <fieldset class="form-group row">
          <%= f.label :started_at, :class => 'col-form-label col-sm-2' %>
          <div class="col-sm-10">
            <%= f.text_field :started_at, :class => 'form-control' %>
          </div>
        </fieldset>
        <fieldset class="form-group row">
          <%= f.label :ended_at, :class => 'col-form-label col-sm-2' %>
          <div class="col-sm-10">
            <%= f.text_field :ended_at, :class => 'form-control' %>
          </div>
        </fieldset>
        <div class="form-group">
          <%= t '.reminder' %>
  