* "wzName" should contain shape name
* MS Word watermark has text inside the "gtextUNICODE"
  (do not create additional shptxt)

Change-Id: I7929ec83a9219d6087d36ccbf6d7e735acf63722
Reviewed-on: https://gerrit.libreoffice.org/38219Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>