Comment 10 for bug 1922961

This bug does NOT apply to Windows, there we pack the needed ``qtbase_`` catalog [1] correctly [5].
The catalog is in the qttranslations-everywhere-src-5.xx.x.zip submodule, part of a default qt installation.

We need to add this to the build requirements for the other supported platforms too.

[1] https://doc.qt.io/qt-5/internationalization.html#locating-qt-translations
[2] https://github.com/mixxxdj/mixxx/blob/2.3/CMakeLists.txt#L1416