[PrivacyBadger] Privacy Badger version 2017.11.20 released

[Alexei]

Privacy Badger 2017.11.20 has been released for all supported browsers.
As always, you can get it from https://www.eff.org/privacybadger
or from your browser's add-on gallery.

Notable updates:

* Disabled custom tooltips in Firefox to work around browser freezing issues
* Added validation to whitelisted domains form
* Improved translations (Dutch, Esperanto and German)
* Added Bulgarian and Polish translations

For further details, consult our release notes on GitHub:
https://github.com/EFForg/privacybadger/releases/tag/release-2017.11.20