Partial merge of the data migration code.
Merge branch 'staging' into x-stevetest
Require babelsubs for the data migration.
tern: don't order_by ? because mysql is awful
tern: randomize again, but without mysql's "help"
tern: remove an extraneous save()

The subtitles_fetched_counter field is a magic Redis field.  It gets saved to
Redis the moment it gets set, so there's no reason to re-save the new SL --
it's just a waste of a database call.
tern: report metrics on version syncs correctly
Add teams migrations to the intermediate DMR code.
tern: report errors as metrics
Adjust frozen apps in the migration.  Send help.
More frozen edits.  Sigh.
Update the team models to match the new migrations.
tern: delete contentless, languageless languages
(cherry picked from commit 9d8997f4adad57cc099531736618098a6123e72a)
tern: log the various fixes of empty languages
(cherry picked from commit e104b9d953a483effb186af7a379373589b50fc3)
tern: log when we skip empty languages too
(cherry picked from commit a09f84a8ab7656e1684b0f500f2563e9b9a31ac4)
tern: log duplicate language version counts

This should help us get a handle on the duplicate language situation.  Are most
duplicate languages empty?  Is there usually one that has lots of versions while
the rest have few?  I don't know.  Let's find out.
(cherry picked from commit a9a57f1fb7384dfd3f92fe41aad2a2a5f47e5e5e)
tern: log subtitle counts for dupes too

Why not?  More data is good and we're not gonna run out of hard drive space.
(cherry picked from commit dafdda5838657ba2dd3a08e387a9b9a583b33cac)
Added migration that creates full_name property
on ThirdPartyAccounts
Added migration that ports all youtube third party accounts username to full_name and the real username to username.
username -> full_name