def get_all_tags_names_as_list(self, admin=False, language="en"):
        """ Computes and cache two list containing all tags name sorted by natural order on name """

        if admin:
            if self._all_tags_cache_list_admin != {} and language in self._all_tags_cache_list_admin:
                return self._all_tags_cache_list_admin[language] #Cache hit
        else:
            if self._all_tags_cache_list != {} and language in self._all_tags_cache_list:
                return self._all_tags_cache_list[language] #Cache hit
                        
        #Cache miss, computes everything
        s_stud = set()
        s_admin = set()
        (common, _, org) = self.get_all_tags()
        for tag in common + org:
            # Is tag_name_with_translation correct by doing that like that ?
            tag_name_with_translation = self.gettext(language, tag.get_name()) if tag.get_name() else ""
            s_admin.add(tag_name_with_translation) 
            if tag.is_visible_for_student():
                s_stud.add(tag_name_with_translation) 
        self._all_tags_cache_list_admin[language] = natsorted(s_admin, key=lambda y: y.lower())
        self._all_tags_cache_list[language] = natsorted(s_stud, key=lambda y: y.lower())
        
        if admin:
            return self._all_tags_cache_list_admin[language]
        return self._all_tags_cache_list[language]
Computes and cache two list containing all tags name sorted by natural order on name