fdo#83955 Track Changes: Improve the changes toolbar

Change-Id: I50986a5c3d55890536dd2b1736887a816c931699
Reviewed-on: https://gerrit.libreoffice.org/11575
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>