- downgraded zh_TW.Big5 po files to previous versions. Latest failed to

compile
- fixed some charsets in a couple of po files
- remove libPropList question from Install script

po/bg.po

@@ -16,7 +16,7 @@ msgstr ""
 "Language-Team: Bulgarian <dict@linux.home.bg>\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=windows-1251\n"
-"Content-Transfer-Encoding: 8bit\n"
+"Content-Transfer-Encoding: 8-bit\n"
 
 #: ../src/appicon.c:550 ../src/dialog.c:230 ../src/dock.c:3291
 #: ../src/dockedapp.c:211 ../src/main.c:254 ../src/rootmenu.c:1765

po/el.po

@@ -11,8 +11,8 @@ msgstr ""
 "Last-Translator: Nikolaos Papagrigoriou <papanikos@freemail.gr>\n"
 "Language-Team: Greek\n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=el\n"
-"Content-Transfer-Encoding: iso8859-7\n"
+"Content-Type: text/plain; charset=iso-8859-7\n"
+"Content-Transfer-Encoding: 8-bit\n"
 "**************************\n"
 "Words from the maintainer in Greek:\n"
 "Ç ìåôÜöñáóç åßíáé áêüìç óå áñ÷éêü óôÜäéï. Ôá ìõíÞìáôá ðïõ åìöáíßæïíôáé óôçí\n"

po/no.po

@@ -11,8 +11,8 @@ msgstr ""
 "Last-Translator: Marcus Ramberg <draven@mo.himolde.no>\n"
 "Language-Team: Norwegian \n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=CHARSET\n"
-"Content-Transfer-Encoding: ENCODING\n"
+"Content-Type: text/plain; charset=iso-8859-1\n"
+"Content-Transfer-Encoding: 8-bit\n"
 
 #: ../src/generic/error.c:46
 msgid " fatal error: "

po/pl.po

@@ -14,8 +14,8 @@ msgstr ""
 "Last-Translator: Piotr Dembiñski <pdemb@fanthom.math.put.poznan.pl>\n"
 "Language-Team: Polish <pl@li.org>\n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=ISO8859-2\n"
-"Content-Transfer-Encoding: ISO8859-2\n"
+"Content-Type: text/plain; charset=iso-8859-2\n"
+"Content-Transfer-Encoding: 8-bit\n"
 
 #: ../src/appicon.c:509 ../src/dialog.c:216 ../src/dialog.c:272
 #: ../src/dock.c:3059 ../src/dockedapp.c:206 ../src/winspector.c:283