QString Formatting::validityShort( const UserID & uid ) {
    if ( uid.isRevoked() )
	return i18n("revoked");
    if ( uid.isInvalid() )
	return i18n("invalid");
    switch ( uid.validity() ) {
    case UserID::Unknown:   return i18nc("unknown trust level", "unknown");
    case UserID::Undefined: return i18nc("undefined trust", "undefined");
    case UserID::Never:     return i18n("untrusted");
    case UserID::Marginal:  return i18nc("marginal trust", "marginal");
    case UserID::Full:      return i18nc("full trust", "full");
    case UserID::Ultimate:  return i18nc("ultimate trust", "ultimate");
    }
    return QString();
}