Clean up HAML.

- Add haml-lint config file to allow long lines. This is temporary
until I can find a HAML syntax highlighter that supports splitting
attributes on multiple lines.

- Clean up HAML to make haml-lint pass

- Convert application layout to HAML

- Fix bug that caused google translate initialization to time out. The
JS was looking for an ID called `google-translate-element`, but in the
layout it was called `google_translate_element`.

- Make description meta attribute localizable.