How does your retranslation routine look like? Designer generates one for you (it's called retranslateUi()) and it should be invoked from a changeEvent, so you can override it by reimplementing changeEvent and for example clearing the contents of the box before you call retranslateUi.

The links you provided lead into 404, by the way. And that's exactly why we keep asking people to attach code instead of linking to it.