Move English documentation to folder en_US

doc/en_US/faq.markdown

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+Frequently Asked Questions
+==========================
+
+Can you recommend a web hosting provider for Kanboard?
+------------------------------------------------------
+
+Kanboard works well with any great VPS hosting provider such as [Digital Ocean](https://www.digitalocean.com/?refcode=4b541f47aae4),
+[Linode](https://www.linode.com/?r=4e381ac8a61116f40c60dc7438acc719610d8b11) or [Gandi](https://www.gandi.net/).
+
+To have the best performances, choose a provider with fast disk I/O because Kanboard use Sqlite by default.
+Avoid hosting providers that use a shared NFS mount point.
+
+
+I have the error "There is no suitable CSPRNG installed on your system"
+-----------------------------------------------------------------------
+
+If you use PHP < 7.0, you need to have the openssl extension enabled or `/dev/urandom` accessible from the application if restricted by an `open_basedir` restriction.
+
+
+Page not found and the URL seems wrong (&amp;amp;)
+--------------------------------------------------
+
+- The URL looks like `/?controller=auth&amp;action=login&amp;redirect_query=` instead of `?controller=auth&action=login&redirect_query=`
+- Kanboard returns a "Page not found" error
+
+This issue comes from your PHP configuration, the value of `arg_separator.output` is not the PHP's default, there is different ways to fix that:
+
+Change the value directly in your `php.ini` if you can:
+
+```
+arg_separator.output = "&"
+```
+
+Override the value with a `.htaccess`:
+
+```
+php_value arg_separator.output "&"
+```
+
+Otherwise Kanboard will try to override the value directly in PHP.
+
+
+Authentication failure with the API and Apache + PHP-FPM
+--------------------------------------------------------
+
+php-cgi under Apache does not pass HTTP Basic user/pass to PHP by default.
+For this workaround to work, add these lines to your `.htaccess` file:
+
+```
+RewriteCond %{HTTP:Authorization} ^(.+)$
+RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
+```
+
+
+Known issues with eAccelerator
+------------------------------
+
+Kanboard doesn't work very well with [eAccelerator](http://eaccelerator.net).
+The issue caused can be a blank page or an Apache crash:
+
+```
+[Wed Mar 05 21:36:56 2014] [notice] child pid 22630 exit signal Segmentation fault (11)
+```
+
+The best way to avoid this issue is to disable eAccelerator or define manually which files you want to cache with the config parameter `eaccelerator.filter`.
+
+The project [eAccelerator seems dead and not updated since 2012](https://github.com/eaccelerator/eaccelerator/commits/master).
+We recommend to switch to the last version of PHP because it's bundled with [OPcache](http://php.net/manual/en/intro.opcache.php).
+
+
+Why the minimum requirement is PHP 5.3.3?
+-----------------------------------------
+
+Kanboard uses the function `password_hash()` to crypt passwords but it's available only for PHP >= 5.5.
+
+However, there is a back-port for [older versions of PHP](https://github.com/ircmaxell/password_compat#requirements).
+This library requires at least PHP 5.3.7 to work correctly.
+
+Apparently, Centos and Debian back-ports security patches so PHP 5.3.3 should be ok.
+
+Kanboard v1.0.10 and v1.0.11 requires at least PHP 5.3.7 but this change has been reverted to be compatible with PHP 5.3.3 with Kanboard >= v1.0.12
+
+
+How to test Kanboard with the PHP built-in web server?
+------------------------------------------------------
+
+If you don't want to install a web server like Apache on localhost. You can test with the [embedded web server of PHP](http://www.php.net/manual/en/features.commandline.webserver.php):
+
+```bash
+unzip kanboard-VERSION.zip
+cd kanboard
+php -S localhost:8000
+open http://localhost:8000/
+```
+
+
+How to install Kanboard on Yunohost?
+------------------------------------
+
+[YunoHost](https://yunohost.org/) is a server operating system aiming to make self-hosting accessible to everyone.
+
+There is a [package to install Kanboard on Yunohost easily](https://github.com/mbugeia/kanboard_ynh).
+
+
+Where can I find a list of related projects?
+--------------------------------------------
+
+- [Kanboard API python client by @freekoder](https://github.com/freekoder/kanboard-py)
+- [Kanboard Presenter by David Eberlein](https://github.com/davideberlein/kanboard-presenter)
+- [CSV2Kanboard by @ashbike](https://github.com/ashbike/csv2kanboard)
+- [Kanboard for Yunohost by @mbugeia](https://github.com/mbugeia/kanboard_ynh)
+- [Trello import script by @matueranet](https://github.com/matueranet/kanboard-import-trello)
+- [Chrome extension by Timo](https://chrome.google.com/webstore/detail/kanboard-quickmenu/akjbeplnnihghabpgcfmfhfmifjljneh?utm_source=chrome-ntp-icon), [Source code](https://github.com/BlueTeck/kanboard_chrome_extension)
+- [Python client script by @dzudek](https://gist.github.com/fguillot/84c70d4928eb1e0cb374)
+- [Shell script for SQLite to MySQL/MariaDB migration by @oliviermaridat](https://github.com/oliviermaridat/kanboard-sqlite2mysql)
+- [Git hooks for integration with Kanboard by Gene Pavlovsky](https://github.com/gene-pavlovsky/kanboard-git-hooks)
+
+
+Are there some tutorials about Kanboard in other languages?
+-----------------------------------------------------------
+
+- [German article series about Kanboard](http://demaya.de/wp/2014/07/kanboard-eine-jira-alternative-im-detail-installation/)
+
+
+Tips
+----
+
+- [Easy way to remove name constraint in SQLite database](https://github.com/kanboard/kanboard/issues/1508)