- Backend response error must not be put into Redux state
- Failed proxy request with status code 504 produces circular JSON structure

added data from err to ssr-error page

removed scripts load from ssr-error template

changed ssr-error code from 500 to 503

- No clientId, clientSecret

Google+ login fixed imports

Fixed SSR Google+ login

Fixed imports for Google+ login, moved GOOGLE_CLIENT_ID to dev webpack config

- Language detection updated
- Using <base href="/virtua-l/path" /> for SSR, development uses "/"