fdo#39468 Translate German Comments - sc/source/filter/{lotus,starcalc,xml}

V2 with changes suggested by Samuel and Eike

Change-Id: I3bc7e5c5173fe06d29f32bab1973828fdfb33d53
Reviewed-on: https://gerrit.libreoffice.org/12036
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>