reconvert_to_old.py

import polib

def reconvert(filename):
	po = polib.pofile(open(filename, encoding='utf-8').read())
	lines = []

	for entry in po:
		if entry.msgstr:
			lines.append(entry.msgid)
			lines.append("== " + entry.msgstr)

	lines.append("")

	with open(filename + '.txt', 'w', encoding='utf-8') as out:
		out.write("\n".join(lines))

if __name__ == '__main__':
	import sys
	for filename in sys.argv[1:]:
		reconvert(filename)