[enh] update translations

Lots of Flake8 corrections
Maybe we should change the rule to allow lines of 120 chars. It seems more usable.

Big twitter correction : now it outputs the words in right order...

Digg engines, with thumbnails
Add pubdate for twitter

fetched from https://github.com/pointhi/leaflet-color-markers

Conflicts:
	searx/templates/courgette/result_templates/default.html
	searx/templates/courgette/result_templates/map.html
	searx/templates/courgette/result_templates/videos.html
	searx/templates/default/result_templates/default.html
	searx/templates/default/result_templates/map.html
	searx/templates/default/result_templates/videos.html
	searx/webapp.py

SubtitleSeeker Engine

Rework Flickr Engine

[fix] fix language support in photon engine

Add 500px and Searchcode engines

Allow to search for images on 500px. It doesn't use the official API, but the page result. Less stable, but less API key to possess...

Two engines were necessary for Searchcode because there are to search mode : search for documentation or search for code example. Both use open APIs.

[fix][enh] Multiple JS changes in Oscar

[enh] add photon engine, and fix pep8 errors

Definitely remove engine array
Change every themes to accomodate that change
Tweak of video template of oscar to add link on video thumbnail

Conflicts:
	searx/engines/flickr.py
	searx/settings.yml

It uses the webpage json infos to build the results
Let the user choose the engine in setting.yml. Noapi active by default
+ little corrections on Flickr engine