Add comment to prevent future accidents

Change-Id: Iab4ccbebc412861892205934792c48f46335af3d
Add blacklist to pywikipedia

We do seem to have translations in these languages,
which messes up the export unless removed or
blacklisted

Change-Id: I8a48b38e1d5a95e611bd5948a6e4993cb184a45e
Merge "Add comment to prevent future accidents"
Merge "Add blacklist to pywikipedia"