This patch changes "Enqueued on", "Started on", and "Ended on" to
"Queued", "Started", and "Ended" respectively on the bacground jobs
page.
Task plan:
1. Navigate to the background jobs page
2. Ensure the spelling change, and that the spelling is correct.
Signed-off-by: Owen Leonard <oleonard@myacpl.org> Signed-off-by: Julian Maurice <julian.maurice@biblibre.com> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>