code: func (b *Bundle) MustTfuncAndLanguage(pref string, prefs ...string) (TranslateFunc, *language.Language) {
  	tfunc, language, err := b.TfuncAndLanguage(pref, prefs...)
  	if err != nil {
  		panic(err)
  	}
  	return tfunc, language
  }
docs: // MustTfuncAndLanguage is similar to TfuncAndLanguage except it panics if an error happens.