Fix locale switcher URL in shared header

mandelstudio/templates/oxyan/partials/language_chooser.html

@@ -8,7 +8,7 @@
     <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
         {% get_language_info_list for languages as languages %}
         {% ocyanjson "i18n" "language_chooser_disabled_options" "" as disabled_languages %}
-        <form action="{% url set_language %}" method="post" class="language_form">
+        <form action="{% url 'set_language' %}" method="post" class="language_form">
             {% csrf_token %}
             <input name="next" type="hidden" value="{{ language_neutral_url_path|default:request.path|untranslated_url }}"/>
             {% for language in languages %}