Adding default localizations

Without the following internationalizations, things look ugly in the
internal app:
    :institution_name:
    :institution_homepage_url:
    :division_name:
    :division_homepage_url:
Merge pull request #54 from ndlib/adding-default-internationalizations

Adding default localizations. Fixes https://travis-ci.org/ndlib/curate/builds/10537490