Get rid of all language we don't need.

Summary:
third_party/babel/localedata comes with 664 languages, which is
great for coverage but bad for webapp startup time on appengine:
these files all live in third_party.zip, making that file big,
which is bad since appengine sucks at reading data files.  This
makes all third-party imports slow, and all babel localedata reads
slow.

So to speed things up, I deleted all language files that weren't
used by an actively supported language: one in active_languages()
or lite_languages(), or in language_tag_prefixes() of either.  (That
last step may be overkill, but I felt better safe than sorry.)

Test Plan:
I ran the new localedata linter (from
http://phabricator.khanacademy.org/D4625) without error.

Reviewers: james

CC: ben

Differential Revision: http://phabricator.khanacademy.org/D4626
Get rid of all language we don't need.

Summary:
third_party/babel/localedata comes with 664 languages, which is
great for coverage but bad for webapp startup time on appengine:
these files all live in third_party.zip, making that file big,
which is bad since appengine sucks at reading data files.  This
makes all third-party imports slow, and all babel localedata reads
slow.

So to speed things up, I deleted all language files that weren't
used by an actively supported language: one in active_languages()
or lite_languages(), or in language_tag_prefixes() of either.  (That
last step may be overkill, but I felt better safe than sorry.)

Undelete the various no dialects: nb and nn.  We'll be using them soon.

Test Plan:
I ran the new localedata linter (from
http://phabricator.khanacademy.org/D4625) without error.

Fingers crossed.

Reviewers: james

Reviewed By: james

CC: ben

Differential Revision: http://phabricator.khanacademy.org/D4626