* Add support for Lingva translations in results
Searches that contain the word "translate" and are normal search queries
(i.e. not news/images/video/etc) now create an iframe to a Lingva url to
translate the user's search using their configured search language.
The Lingva url can be configured using the WHOOGLE_ALT_TL env var, or
will fall back to the official Lingva instance url (lingva.ml).
For more info, visit https://github.com/TheDavidDelta/lingva-translate
* Add basic test for lingva results
* Allow user specified lingva instances through csp frame-src
* Fix pep8 issue
bcb1d8ecc9