Comment 1 for bug 319153

The attached branch re-checks messages in Hardy and later for gettext errors when given the selection clause:

  is_current IS TRUE AND id >= 74539159 AND EXISTS (
    SELECT * FROM POTMsgSet
    WHERE
      POTMsgSet.sequence > 0 AND
      POTMsgSet.id = TranslationMessage.potmsgset AND
      flagscomment LIKE '%format%'
  )

Took just under 6 hours on staging, of which about 24 minutes were spent collecting the TranslationMessages. It may be advisable to break it down into chunks.