Add nonce validation

templates/partials/comments.html.twig

@@ -21,6 +21,8 @@
             <button class="button" type="{{ button.type|default('submit') }}">{{ button.value|default('Submit') }}</button>
         {% endfor %}
         </div>
+
+        {{ nonce_field('form', 'form-nonce') }}
     </form>
 
     <div class="alert">{{ form.message }}</div>