Fix translations in Qt6-based AppImages

Dmitry Kazakovrequested to merge
dkazakov/krita:kazakov/qt6-appimage-translations into master

In Qt5 version of Krita we used to patch ki18n to look for translations in QStandardPaths::AppLocalDataLocation and then manually move them into this location in the AppImage creation script.

In Qt6 we dropped this patch over ki18n and it now searches translations in the correct location, i.e. in StandardPaths::GenericDataLocation.

So now we should install it into /share/locale instead of /share/krita/locale

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