Merge remote-tracking branch 'origin/master' into 2.2

# Conflicts:
#	.editorconfig
#	docs/de/index.rst
#	docs/de/user/import.rst
#	docs/en/index.rst
#	docs/en/user/configuration.rst
#	docs/en/user/import.rst
#	docs/fr/index.rst
#	docs/fr/user/import.rst
#	src/Wallabag/CoreBundle/Command/InstallCommand.php
#	src/Wallabag/CoreBundle/Resources/translations/messages.da.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.de.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.en.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.es.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.fa.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.fr.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.it.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.oc.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.pl.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.pt.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.ro.yml
#	src/Wallabag/CoreBundle/Resources/translations/messages.tr.yml
#	src/Wallabag/CoreBundle/Resources/views/themes/baggy/Config/index.html.twig
#	web/bundles/wallabagcore/themes/baggy/css/style.min.css
#	web/bundles/wallabagcore/themes/baggy/js/baggy.min.js
#	web/bundles/wallabagcore/themes/material/css/style.min.css
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diff --git a/docs/en/developer/redis.rst b/docs/en/developer/redis.rst
deleted file mode 100644
index ea084e66..00000000
--- a/docs/en/developer/redis.rst
+++ /dev/null
@@ -1,75 +0,0 @@
-Install Redis for asynchronous tasks
-====================================
-
-In order to launch asynchronous tasks (useful for huge imports for example), we can use Redis.
-
-Requirements
-------------
-
-You need to have Redis installed on your server.
-
-Installation
-~~~~~~~~~~~~
-
-.. code:: bash
-
-  apt-get install redis-server
-
-Launch
-~~~~~~
-
-The server might be already running after installing, if not you can launch it using:
-
-.. code:: bash
-
-  redis-server
-
-
-Configure Redis in wallabag
----------------------------
-
-Edit your ``app/config/parameters.yml`` file to edit Redis configuration. The default one should be ok:
-
-.. code:: yaml
-
-    redis_host: localhost
-    redis_port: 6379
-
-Enable Redis in wallabag
-------------------------
-
-In internal settings, in the **Import** section, enable Redis (with the value 1).
-
-Launch Redis consumer
----------------------
-
-Depending on which service you want to import from you need to enable one (or many if you want to support many) cron job:
-
-.. code:: bash
-
-  # for Pocket import
-  bin/console wallabag:import:redis-worker -e=prod pocket -vv >> /path/to/wallabag/var/logs/redis-pocket.log
-
-  # for Readability import
-  bin/console wallabag:import:redis-worker -e=prod readability -vv >> /path/to/wallabag/var/logs/redis-readability.log
-
-  # for Instapaper import
-  bin/console wallabag:import:redis-worker -e=prod instapaper -vv >> /path/to/wallabag/var/logs/redis-instapaper.log
-
-  # for wallabag v1 import
-  bin/console wallabag:import:redis-worker -e=prod wallabag_v1 -vv >> /path/to/wallabag/var/logs/redis-wallabag_v1.log
-
-  # for wallabag v2 import
-  bin/console wallabag:import:redis-worker -e=prod wallabag_v2 -vv >> /path/to/wallabag/var/logs/redis-wallabag_v2.log
-
-  # for Firefox import
-  bin/console wallabag:import:redis-worker -e=prod firefox -vv >> /path/to/wallabag/var/logs/redis-firefox.log
-
-  # for Chrome import
-  bin/console wallabag:import:redis-worker -e=prod instapaper -vv >> /path/to/wallabag/var/logs/redis-chrome.log
-
-If you want to launch the import only for some messages and not all, you can specify this number (here 12) and the worker will stop right after the 12th message :
-
-.. code:: bash
-
-  bin/console wallabag:import:redis-worker -e=prod pocket -vv --maxIterations=12