[MU4] Add (back) some missing qt_*.ts files

[Jojo-Schmitz]

that are not provided by Qt (or in a bogus form). See e.g. fe849f3, 7067c5a, 8fb3961, 83b2689, 504b954 for some history when and why they got added/changed.

If Qt provides them, those from Qt take precedence, as they are getting copied later.

Fixes #12700