Fix translations not showing in the Sort by and Additional Information submenus

[Frank Reininghaus]

Hi Christoph,

2012/8/23 Christoph Feck:
> Hi Albert and Frank,
>
> Regarding the "(I18N_EMPTY_MESSAGE)" in Dolphin menus,
> the problem is indeed caused by above commit.
>
> The issue is that the code expects an empty string for the group
> header, if the actions should not be grouped in a sub-menu, but stay
> at top level.
>
> Attached patch fixes the issue for me, but I don't like the long line,
> so please improve :)

thanks again, fixed now:

https://projects.kde.org/projects/kde/kde-baseapps/repository/revisions/168d0511c754008cc679589566d961beb9f6cc10