fdo#39468 Translate German comments - sw/source/core/{sw3io|swg|unocore}

- Convert Deutsche Mark (DM) to Euro (EUR)
- Fix some whitespace

Change-Id: I94e0c9cbf5f5defca2e0d0f59f08592a914a381b
Reviewed-on: https://gerrit.libreoffice.org/12011
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>