Improve Job Dialog buttons' icons and text
The buttons were on the wrong side of the window, lacked icons, and the affirmative
button said "run" which didn't match the verb used in the dialog's title "send".
This patch corrects those issues.
Reviewers: nicolasfella, apol, GB_2, VDG
Reviewed By: nicolasfella, GB_2, VDG
Differential Revision: https://phabricator.kde.org/D22055