Shows an infobar with a link to the respective wiki page
Adds a button to the About dialog
Replaces If6eb1542d2ad310226f76850f480f2f99070b803

Change-Id: I1eeb504994a6364feb90cfa447029875e0ec1969
Reviewed-on: https://gerrit.libreoffice.org/72218
Tested-by: Jenkins
Reviewed-by: Heiko Tietze <tietze.heiko@gmail.com>
Tested-by: Heiko Tietze <tietze.heiko@gmail.com>