change form action to work with multilang

templates/partials/comments.html.twig

@@ -3,7 +3,7 @@
     <h3>{{'PLUGIN_COMMENTS.ADD_COMMENT'|t}}</h3>
 
     <form name="{{ grav.config.plugins.comments.form.name }}"
-          action="{{ uri.rootUrl ~ (grav.config.plugins.comments.form.action|default(page.route)) }}"
+          action="{{ grav.config.plugins.comments.form.action ?  base_url ~ grav.config.plugins.comments.form.action : page.url }}"
           method="{{ grav.config.plugins.comments.form.method|upper|default('POST') }}">
     {% for field in grav.config.plugins.comments.form.fields %}
 
@@ -41,4 +41,4 @@
             {% endfor %}
         </table>
     {% endif %}
-{% endif %}
+{% endif %}