fdo#39468 Start translating German comments in sw/source/core/inc

Change-Id: I77e61fb268188d7c26132b10d1308daf1bebc741
Reviewed-on: https://gerrit.libreoffice.org/11761
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>