New translation into Dutch for Window Maker

Because the existing nl locale files are ancient and obsolete,
the user interface stays mainly in English with hardly Dutch text
showing up.

This is a complete translation in 6 parts from scratch, using the
current (pl)menus and Makefile generated .pot files. These files
provide a very good, and thoroughly checked user interface in the
Dutch language.

Adding me as a maintainer in related README files; removing previous
maintainer (e-mail bounced).

Removing unnecessary executable bit from pt.po on the fly.

po/README

@@ -19,7 +19,6 @@ ko.po	Korean		1,2	Byeong-Chan Kim <redhands@linux.sarang.net>
 sv.po	Swedish			John Forgoil <forgoil@rsn.hk-r.se>
 cs.po	Czech		3	Jiri Hnidek <Jiri.Hnidek@vslib.cz
 no.po	Norwegian		Marcus Ramberg <draven@mo.himolde.no>
-nl.po	Dutch			Roeland Mertens <roeland@zeus.rug.ac.be>
 gl.po	Galician		Xose Vazquez Perez <xose.vazquez@gmail.com>
 fr.po	French			Bastien Nocera <hadess@hadess.net>
 				Jean-Francois BIGNOLLES <bignolle@grif.fr>
@@ -49,6 +48,7 @@ be.po	Belarusian		Ihar Viarheichyk <iverg@mail.ru>
 ca.po	Catalan			Ernest Adrogué <eadrogue@gmx.net>
 bs.po	Bosnian			Ahmet Mulalic <am@lugzdk.ba>
 hy.po   Armenian                Norayr Chilignaryan <chnorik@gmail.com>
+nl.po	Dutch			Alwin <translations@ziggo.nl>
 
 
 Some translations are based on previous translations by other people.