po: add European Portuguese translation, rename old pt to pt_BR

The existing pt.po was Brazilian Portuguese, so move it to pt_BR.po
unchanged and add a new European Portuguese pt.po. Register pt_BR in
EXTRA_DIST and update the maintainer table in po/README.

Imported from window-maker/wmaker pull request 68.

po/Makefile.am

@@ -7,7 +7,7 @@ CLEANFILES = $(CATALOGS) $(DOMAIN).pot
 # Please keep this sorted in alphabetic order!
 EXTRA_DIST = be.po bg.po bs.po ca.po cs.po da.po de.po el.po es.po et.po \
 	fi.po fr.po fy.po gl.po hr.po hu.po hy.po it.po ja.po ko.po ms.po nl.po \
-	no.po pl.po pt.po ro.po ru.po sk.po sr.po sv.po tr.po uk.po zh_CN.po \
+	no.po pl.po pt.po pt_BR.po ro.po ru.po sk.po sr.po sv.po tr.po uk.po zh_CN.po \
 	zh_TW.po
 
 POTFILES  = \

po/README

@@ -3,7 +3,8 @@ File	Language	Note	Current Maintainer
 ja.po	Japanese	1	ABE Shige <sabe@ibm.net>
 				MANOME Tomonori <manome@itlb.te.noda.sut.ac.jp>
 				Takeo Hashimoto <HashimotoTakeo@mac.com>
-pt.po	Portuguese		Eliphas Levy Theodoro <eliphas@conectiva.com.br>
+pt_BR.po Brazilian Portuguese	Eliphas Levy Theodoro <eliphas@conectiva.com.br>
+pt.po	Portuguese		Hugo Carvalho <hugokarvalho@hotmail.com>
 de.po	German			Torsten Marek <torsten.marek@vbdnet.de>
 				Bernd Eggert <Bernd.Eggert@t-online.de>
 				Matthias Warkus <mawarkus@t-online.de>