remove duplicate config-entry in proftpd.conf for gentoo, fixes #1247

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
remove unknown user 'froxlorftp' and use nobody/nogroup (default) for proftpd on gentoo, fixes #1249

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
remove duplicate, old and wrong language entry in dutch language file, fixes #1250

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>