Fix language switcher in CKAN webpages

ckan/templates/snippets/language_selector.html

@@ -3,7 +3,7 @@
   <label for="field-lang-select">{{ _('Language') }}</label>
   <select id="field-lang-select" name="url" data-module="autocomplete" data-module-dropdown-class="lang-dropdown" data-module-container-class="lang-container">
     {% for locale in h.get_available_locales() %}
-      <option value="{% url_for h.current_url(), locale=locale.short_name %}" {% if locale.identifier == current_lang %}selected="selected"{% endif %}>
+      <option value="{% url_for h.current_url(), locale=locale %}" {% if locale == current_lang %}selected="selected"{% endif %}>
         {{ locale.display_name or locale.english_name }}
       </option>
     {% endfor %}