Apparently this was forgotten; Writer and Calc already support this.

Change-Id: I1a187b54294cb84a1b48ef8e855cc75df3f75dd7
Reviewed-on: https://gerrit.libreoffice.org/15953Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>