D18046: [kitemviews] Change the search in Desktop Behavior/Activities to more in line with other search labels

[Root]

rooty added a task: T10258: Use correct search bars and use ellipsis whenever 
needed to follow the KDE HIG.

REPOSITORY
  R276 KItemViews

REVISION DETAIL
  https://phabricator.kde.org/D18046

To: rooty, #vdg, #plasma, kde-frameworks-devel
Cc: kde-frameworks-devel, michaelh, ngraham, bruns