ikiwiki generates buggy PO files with po4a 0.62
Reported by @serna on #18667 (comment 189882):
@intrigeri @zen There's something wrong with the generated files. For example see: https://translate.tails.boum.org/translate/tails/about/es/?checksum=3b916b9bf7387ed5
But if you check all files where there are some other symbols you will see a random character appended or in the place of the original symbol (https://translate.tails.boum.org/translate/tails/sound_and_video/es/?checksum=ddce44ef231f8a52)