Problems with 301 redirects an BABEL

# The Friendly URLs part
# redirect original domain.name to domain.name/defaultLang
RewriteCond %{HTTP_HOST} .
RewriteRule ^$ de/ [R=301,L]

#https://github.com/chsmedien/XRouting/issues/19#issuecomment-173992718
RewriteCond %{REQUEST_URI} ^/(de|en|zh)$
RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1/ [R=301,L]

# The Friendly URLs part
# detect language when requesting the root (/)
RewriteCond %{HTTP:Accept-Language} !^de [NC]
RewriteRule ^$ en/ [R=301,L]
RewriteRule ^$ de/ [R=301,L]
RewriteRule ^$ zh/ [R=301,L]
 
# redirect all requests to /en/favicon.ico and /de/favicon.ico
# to /favicon.ico
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(en|de|zh)/favicon.ico$ favicon.ico [L,QSA]
 
# redirect all requests to /en/assets* and /de/assets* to /assets*
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(en|de|zh)/assets(.*)$ assets$2 [L,QSA]
 
# redirect all other requests to /en/* and /de/*
# to index.php and set the cultureKey parameter
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(en|de|zh)?/?(.*)$ index.php?cultureKey=$1&q=$2 [L,QSA]