Fix string placeholders in two translations

As the translation in Qt 5 is more out of date this is being fixed
directly in the Qt 4.8 version as this is more accurate.

Change-Id: Ie7abbd224e26f8af63d80acd81ddf2973b39e0d4
Reviewed-by: Liang Qi <liang.qi@theqtcompany.com>