fdo#86132 add tooltips to calc xcu file

Change-Id: I9c643e72cb0e925c2d4e5283c6811ef73306c76b
Reviewed-on: https://gerrit.libreoffice.org/13027
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>