Xcode's legacy and new build system modes have different behavior
in how they bundle resource paths that start with lang_code.lproj.
Document how to bundle translation files for both legacy
and new build systems.
Pick-to: 5.15 6.2 6.3 6.4
Fixes: QTBUG-98417
Change-Id: I857ec76577f8244a751d4bf38fbe305fef614734
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
94207621ee