Add language selection
Internationalize some view content
Add locale setting based on tld
Save current locale when signing up
Fix JS feature specs bug

Setting Capybara.app_host to anything other than nil made JS specs fail.
Use default scoping for view translations
Internationalize homepage
Fix specs
Fix flashcard side toggling bug
Internationalize all views except about pages
Convert camelcase to underscore in html ids
Internationalize and translate the intro page
Add trailing newlines to all app files
Internationalize and translate the 'about' page
Add localized model validations
Internationalize controllers