Renamed 'new's app to 'home'; refactored query string translations.

Finally fixed the site structure - the app that displays the home
page is really just a simple CMS, rendering different types of
content. The 'news' was renamed to 'home' to reflect that. Not
a significant change but it makes thinking about how the entire
site is structured much easier.

Refactored the query query strings are handled in different languages,
fixing bugs and updating the search form to support species names and
tags.