make rewrites clearer and unambiguous for search engines

.htaccess

@@ -16,12 +16,12 @@ RewriteRule ^(.*) http://mehl.mx/$1 [R=301,L]
 ## Nice URLs
 # Rewrite URL/de to URL/index.de.php
 RewriteRule ^(..)/?$ /index.$1.php
-# Rewrite URL/en/contact to URL/contact.en.php
+# Rewrite e.g. URL/en/contact to URL/contact.en.php
 RewriteRule ^(..)/(.*)$ /$2.$1.php
 # Rewrite empty URL to standard index page
 RewriteRule ^$ index.de.php
-# Rewrite URL/contact to URL/contact.de.php
-RewriteRule ^([a-z]+)/?$ /$1.de.php
+# Rewrite e.g. URL/contact to URL/de/contact and make it visible
+RewriteRule ^([a-z]+)/?$ /de/$1 [R=301,L]
 
 ## Error Documents
 ErrorDocument 403 /404.php
@@ -59,4 +59,3 @@ AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javasc
   ExpiresByType application/x-httpd-php A604800
   ExpiresByType image/x-icon A2592000
 </ifModule>
-