message: Don't stop importing TMXs on first error
  This is (temporarily) uglier, but more functional, UI. Don't terminate
  imports of multiple TMX files if an error occurs, continue with the rest
  of the files.
  See
diff: @@ -619,8 +619,12 @@ private:
  wxOK | wxICON_ERROR
  ));
  err->SetExtendedMessage(DescribeCurrentException());
  + // FIXME: can't use ShowWindowModalThenDo, as would be better, because multiple
  + // errors may occur in this loop. See https://github.com/vslavik/poedit/issues/748
  + if (paths.size() == 1)
  err->ShowWindowModalThenDo([err](int){});
  - break;
  + else
  + err->ShowModal();
  }
  }
  UpdateStats();
  