+ .uno:InsertMenu scattered in 4 files
+ Same content in each
+ moved to shared/
+ refactor links from trees and main menus
Change-Id: Iafd166596991c3d92e1e721837466456e090e2a3
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/172835
Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>