D10759: Use QLocale instead of QLocale::system

[Friedrich W . H . Kossebau]

kossebau added a reviewer: ilic.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10759

To: aacid, apol, ilic
Cc: apol, #frameworks, #build_system, michaelh