Tooltip added

Change-Id: I098f0680e3240535fae0797e421b5de479adff02
Reviewed-on: https://gerrit.libreoffice.org/51741Reviewed-by: Laurent BP <laurent.balland-poirier@laposte.net>
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>