rhodecode/templates/forms/checkbox.pt

<span tal:define="name name|field.name;
                     true_val true_val|field.widget.true_val;
                     css_class css_class|field.widget.css_class;
                     style style|field.widget.style;
                     oid oid|field.oid;
                     help_block help_block|field.widget.help_block|'';
                    "
      tal:omit-tag="">

<div class="checkbox">
  <input type="checkbox" name="${name}" value="${true_val}"
         id="${oid}"
         tal:attributes="checked cstruct == true_val;
                         class css_class;
                         style style;"
  />
  <p tal:condition="help_block" class="help-block">${help_block}</p>
  <label for="${field.oid}">
    <span tal:condition="hasattr(field, 'schema') and hasattr(field.schema, 'label')"
          tal:replace="field.schema.label" class="checkbox-label" >
    </span>

  </label>
</div>

</span>