fdo#39468 Make svl/ German comment clean

I went through all files manually and checked with the tool.

Change-Id: I2eba5e61a0814dd88d7c2c001cd85db8032f1b9f
Reviewed-on: https://gerrit.libreoffice.org/10545
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>