Removed PO files from repository

Currently, message translation is done at launchpad.  All PO files can
be exported from there. The merge process from launchpad is done when
new release. First download export file from launchpad And use
import-po script to import PO files into po directory.

import-po

@@ -0,0 +1,49 @@
+#!/bin/sh -e
+
+# Update po files using launchpad-export.tar.gz
+
+WORK_DIR=launchpad-work
+INPUT_TGZ=$1
+PO_DIR=po
+
+if [ -z "$INPUT_TGZ" ]; then
+    echo "Usage: import-po /path/to/launchpad-export.tar.gz"
+    echo "Specify input launchpad-export.tar.gz file"
+    exit 1
+fi
+if [ ! -e "$INPUT_TGZ" ]; then
+    echo "Input file $INPUT_TGZ does not exist"
+    exit 1
+fi
+
+if [ -e "$WORK_DIR" ]; then
+    rm -rf "$WORK_DIR"
+fi
+mkdir "$WORK_DIR"
+echo "Extracting po files from the archive..."
+tar -x -C "$WORK_DIR" -f "$INPUT_TGZ"
+
+echo "Renaming po files..."
+# The directory structure of launchpad-export.tar.gz is a bit
+# strange. It even contains absolute file path. We first gather all
+# files in top level directory.
+mv "$WORK_DIR"/aria2/*.po "$WORK_DIR"
+
+echo -n "en@quot en@boldquot" > "$PO_DIR"/LINGUAS
+for file in `ls "$WORK_DIR"/*.po`; do
+    # First remove useless '\r' in messages
+    sed -i -e 's/\\r//' "$file"
+    bn=`basename "$file"`
+    bn=${bn#aria2-}
+    dst="$PO_DIR"/"$bn"
+    # copy file to po directory
+    echo "Moving \`$file' to \`$dst'..."
+    mv "$file" "$dst"
+    # Upate LINGUAS here too.
+    echo -n " ${bn%.po}" >> "$PO_DIR"/LINGUAS
+done
+
+rm -rf "$WORK_DIR"
+
+cd "$PO_DIR"
+make update-po

po/LINGUAS

@@ -1 +0,0 @@
-ar bg ca da de el es fi fr he hu id it ja ko nl nn pl pt pt_BR ru sk sr sv th tr uk vi zh_CN zh_TW en@quot en@boldquot

po/README.rst

@@ -0,0 +1,25 @@
+GNU gettext translation files
+=============================
+
+We use `launchpad
+<https://translations.launchpad.net/aria2/trunk/+pots/aria2>`_ to
+translate gettext translation files (PO files).
+
+The PO files are not stored in the repository. They are exported from
+launchpad and imported to this directory when creating the
+distribution archive.
+
+Exporting PO files from launchpad
+---------------------------------
+
+Visit `launchpad <https://translations.launchpad.net/aria2/trunk/+pots/aria2>`_
+and follow the link ``download``.
+
+Importing PO files from launchpad-export.tar.gz
+-----------------------------------------------
+
+The downloaded file is named as launchpad-export.tar.gz at the time of
+this writing.  It includes all PO files translated at launchpad.  To
+import those files, use ``import-po`` script in the top directory. It
+will deflate the tar.gz file and rename PO files and move them to po
+directory and run ``make update-po``.