Fixed localization of World Clock with Qt6

[tsujan]

QDateTime::toString returned a localized string with Qt5, but it doesn't with Qt6.

[stefonarch]

Working fine , GTM

[stefonarch]

CI fails with

CMake Error at CMakeLists.txt:37 (find_package):
  By not providing "FindQt6DBus.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Qt6DBus", but
  CMake did not find one.

  Could not find a package configuration file provided by "Qt6DBus"
  (requested version 6.6.0) with any of the following names:

    Qt6DBusConfig.cmake
    qt6dbus-config.cmake

  Add the installation prefix of "Qt6DBus" to CMAKE_PREFIX_PATH or set
  "Qt6DBus_DIR" to a directory containing one of the above files.  If
  "Qt6DBus" provides a separate development package or SDK, be sure it has
  been installed.


-- Configuring incomplete, errors occurred!
Error: Process completed with exit code 1.

usr/lib/cmake/Qt6DBus/Qt6DBusConfig.cmake is owned by qt6-base 6.6.2-4

[tsujan]

CI fails with....

Yes. I don't know when CI will succeeded, but it usually does after a while.