add iOS to wordbook

Change-Id: Ie0c2aaf82a918209e19f63dd895710b34013bba4
Reviewed-on: https://gerrit.libreoffice.org/8300
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>