Follow KDE HIG by using ellipis

Summary:
See https://hig.kde.org/style/writing/placeholder.html#actions

@stikonas I add you as reviewer because I saw that you are last contributor to KTorrent :D

Test Plan: Build and run

Reviewers: VDG, stikonas, ngraham

Reviewed By: VDG, stikonas, ngraham

Subscribers: stikonas

Maniphest Tasks: T10258

Differential Revision: https://phabricator.kde.org/D19772