lupdate: Handle translation-attributes of string list properties.
lupdate: Handle translation-attributes of string list properties.

Stringlists now have translation attributes that apply to all
items.

Initial-patch-by: Jarek Kobus <021d51876099fe64879cc5072886d1d0ff71e1ac@nokia.com>

Task-number: QTBUG-8926
Task-number: QTBUG-20440
Change-Id: I230f3907631074df394238e30b3ed7a15adcca4b
Sanity-Review: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Jarek Kobus <021d51876099fe64879cc5072886d1d0ff71e1ac@nokia.com>

mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools,mer-qt/qttools