LanguageCode
const char* LanguageCode() const;
printf("%s_%s.UTF-8\n", conventions.LanguageCode(),
printf("%s.UTF-8\n", conventions.LanguageCode());
printf("%s_%s.UTF-8%s\n", conventions.LanguageCode(),
printf("%s.UTF-8%s\n", conventions.LanguageCode(),
conventions.LanguageCode(), conventions.CountryCode());
conventions.LanguageCode());