Revert i18n stuff for now

Test Plan:
    blinky:/Users/eater/khan/eater/khan-exercises> git diff 3967e6aba90190b52771475918e25d43dcb14d1b
    blinky:/Users/eater/khan/eater/khan-exercises>

Reviewers: alpert, cbhl

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D2061
Unrevert i18n stuff only in the i18n branch for now