According to code, it is expected that minimized copy of
presentation is proposed with ".mini" suffix as default,
but this does not works right now. As a solution a new
localized prefix "(minimized)" is added to filename.

Change-Id: If869c70a5885a9c917fc7254aa8b0d164a6f5a50
Reviewed-on: https://gerrit.libreoffice.org/62781
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>