[xs] add new lang_native_name() template helper

ckan/lib/helpers.py

@@ -156,6 +156,11 @@ def lang():
     ''' Return the language code for the current locale eg `en` '''
     return request.environ.get('CKAN_LANG')
 
+def lang_native_name():
+    ''' Return the langage name currently used in it's localised form '''
+    locale = get_locales_dict().get(lang())
+    return locale.display_name or locale.english_name
+
 class Message(object):
     """A message returned by ``Flash.pop_messages()``.
 
@@ -799,6 +804,7 @@ def process_names(items):
            'snippet',
            'convert_to_dict',
            'activity_div',
+           'lang_native_name',
     # imported into ckan.lib.helpers
            'literal',
            'link_to',