styling for title field; correct input target in tests; make download filename safer with default, max length; in playground index, correctly pass props through to gui container

Remove the default prop test because the default projectId prop comes from redux now, so it doesn't make sense to test the default

Lint

I think this switches all the icons we saw. I also switched the icons on the tabs (the blocks going the wrong way looked bad).

Expected change for a className that uses classNames function now, but didn’t before.

Preview FAQ -> FAQ

Make welcome image in modal match the homepage banners

Preview -> Beta (:D)

HT @paulkaplan

Locale detection function that checks browser setting and lets URL parameter (locale= or lang=) override the browser setting.

Add `?locale=<localecode>` to load in a new langage.
Add `?enable=language` to enable the language selector
Or combine the two: `?enable=language&locale=<localecode>`
Still accepts a hash, but requires that the hash be a sequence of digits.

Added new locales reducer to gui:
- initializes default  react-intl/localeData
- initializes default locale messages for all locales
- default locale is ‘en’ (can be overridden by URL)

Removed dependency on react-intl-redux, added ConnectedIntlProvider (uses correct locale messages from redux based on current locale)

Fixes integration test which was failing trying to use the context menu

It's failing in CI for reasons we don't yet understand