Backport "Reset QLocale internals when we have a custom app language"
Original commit:
commit 8361ddef086795cffc43ef9757198642af2439f9
Author: Albert Astals Cid <aacid@kde.org>
Date: Fri Feb 23 01:36:19 2018 +0100
Reset QLocale internals when we have a custom app language
BACKPORT:krita/4.2