Remove files for translations that we will not use now
Updates messages file without new strings marked
Fixes 'document uploaded' translation

Not only we need to use ungettext for pluralization, but we also need to use
old style string interpolation, since gnu gettext still doesn't support
newstyle formatting. There's an open bug for this: https://savannah.gnu.org/bugs/?30854
Marks strings in the corpus detail page for translation
Marks strings in the corpora list page for translation
Marks strings in the document list page for translation
Marks strings in the document detail page for translation
Marks strings in the 404 page for translation and moves it to the right place
Marks strings in the homepage for translation
Marks strings in the token frequency histogram page for translation
Marks strings in the "what's next" page for translation
Merge pull request #7 from flavioamieiro/feature/update_messages_file

Feature/update messages file