Answered MODX 2.4.0 and Babel: How to set up a default language in .htaccess?

Options +FollowSymLinks

RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^mysite\.com [NC]
RewriteRule (.*) http://mysite.com/$1 [R=301,L]

# The Friendly URLs part
RewriteCond %{REQUEST_URI} (en|ru)$
RewriteRule ^(.*)([^/])$ http://%{HTTP_HOST}/$1$2/ [L,R=301]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(ru|en)/favicon\.ico$ favicon.ico [L,QSA]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(ru|en)/assets/(.*)$ assets/$2 [L,QSA]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]

<?php

// Operating only on Front-end and only with friendly urls
if($modx->event->name != 'OnHandleRequest' || $modx->context->key == 'mgr' || !$modx->getOption('friendly_urls'))
{
	return;
}

// Getting the requested url
$alias = $modx->getOption('request_param_alias', null, 'alias', true);
$request = &$_REQUEST[$alias];
file_put_contents($_SERVER['DOCUMENT_ROOT'] . '/log.txt', print_r($alias, true));

// Selecting contexts with set base_url
$q = $modx->newQuery('modContextSetting', array('key' => 'base_url', 'value:!=' => ''));
$q->select('context_key,value');

$contexts = array();
$tstart = microtime(true);
if($q->prepare() && $q->stmt->execute())
{
	// Accounting teh DB query in global statistics
	$modx->queryTime += microtime(true) - $tstart;
	$modx->executedQueries++;
	// Fetching the result
	while($row = $q->stmt->fetch(PDO::FETCH_ASSOC))
	{
		$base_url = trim($row['value'], '/');
		$context = $row['context_key'];
		// If the request starts with some context's base_url...
		if(preg_match('/^(' . $base_url . ')\//i', $request))
		{
			// ... then we need to switch to this context
			// Except the Web context that is being initialized in index.php
			if($context != 'web')
			{
				$modx->switchContext($context);
			}
			// Cutting out base_url from the request so MODX could find the resource by URI
			$request = preg_replace('/^' . $base_url . '\//', '', $request);
			// All done - leave the loop
			break;
		}
	}
}

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(en|nl|fr|pt|de)?/?(.*)$ index.php?cultureKey=$1&q=$2 [L,QSA]

<?php
if($modx->context->get('key') != "mgr"){
   
    $cultureKey=$_GET["cultureKey"];
    
    
    switch ($cultureKey) {
        case 'en':
            $modx->switchContext('en');
            break;
        case 'pt':
            $modx->switchContext('pt');
            break;
        case 'fr':
            $modx->switchContext('fr');
            break;
        case 'de':
            $modx->switchContext('de');
            break;
        case 'nl':
        default:
            // by default, don't do anything
            $modx->switchContext('web');
            break;
    }
}//if($modx->context->get('key') != "mgr"){

RewriteCond %{HTTP_HOST} .
RewriteCond %{HTTP_HOST} !^www\.bbt4vw\.com [NC]
RewriteRule (.*) http://www.bbt4vw.com/$1 [R=301,L]



# The Friendly URLs part
# detect language when requesting the root (/)
RewriteCond %{HTTP:Accept-Language} !^en [NC]
RewriteRule ^$ en/ [R=301,L]
RewriteRule ^$ nl/ [R=301,L]
RewriteRule ^$ fr/ [R=301,L]
RewriteRule ^$ de/ [R=301,L]
RewriteRule ^$ es/ [R=301,L]
RewriteRule ^$ hr/ [R=301,L]