message: Key backup: Handle case where your onw sig is invalid
  Sometimes life is just like that
diff: @@ -227,11 +227,17 @@ export default class KeyBackupPanel extends React.PureComponent {
  "Backup has a signature from <verify>unknown</verify> device with ID %(deviceId)s.",
  { deviceId: sig.deviceId }, { verify },
  );
  - } else if (sig.device.getFingerprint() === MatrixClientPeg.get().getDeviceEd25519Key()) {
  + } else if (sig.device.getFingerprint() === MatrixClientPeg.get().getDeviceEd25519Key() && sig.valid) {
  sigStatus = _t(
  "Backup has a <validity>valid</validity> signature from this device",
  {}, { validity },
  );
  + } else if (sig.device.getFingerprint() === MatrixClientPeg.get().getDeviceEd25519Key() && !sig.valid) {
  + // it can happen...
  + sigStatus = _t(
  + "Backup has an <validity>invalid</validity> signature from this device",
  + {}, { validity },
  + );
  } else if (sig.valid && sig.device.isVerified()) {
  sigStatus = _t(
  "Backup has a <validity>valid</validity> signature from " +
  