'Takes one POEntry object and converts it (adds a dummy translation to it)
msg is an instance of polib.POEntry'

def convert_msg(self, msg):

    source = msg.msgid
    if (not source):
        return
    plural = msg.msgid_plural
    if plural:
        foreign_single = self.convert(source)
        foreign_plural = self.convert(plural)
        plural = {'0': self.final_newline(source, foreign_single), '1': self.final_newline(plural, foreign_plural)}
        msg.msgstr_plural = plural
    else:
        foreign = self.convert(source)
        msg.msgstr = self.final_newline(source, foreign)
