Add support for gettext message catalogs.

tools/xgettext.sh

@@ -0,0 +1,23 @@
+#! /bin/bash
+
+me=$(basename "${BASH_SOURCE[0]}");
+
+if [[ $# -lt 1 ]]; then
+	echo "Usage: $me FILE..." >&2;
+	exit 1;
+fi
+
+mkdir -p locale;
+echo "Generating template..." >&2;
+xgettext --from-code=UTF-8 -kS -kNS:1,2 -k_ \
+		-o locale/template.pot "$@" \
+		|| exit;
+
+cd locale;
+
+for file in *.po; do
+	echo "Updating $file..." >&2;
+	msgmerge --update "$file" template.pot;
+done
+
+echo "DONE!" >&2;