404 page

static/.htaccess

@@ -1,10 +1,14 @@
 RewriteEngine On
 RewriteBase /
 
+# Redirect old links
 RewriteRule ^(en|de)/(.*)$ /$2 [R=301,L]
 RewriteRule ^(en|de)/?$ / [R=301,L]
 RewriteRule ^about/?$ / [R=301,L]
 
+# Error documents
+ErrorDocument 404 /404.html
+
 # Compression
 AddOutputFilterByType DEFLATE text/plain
 AddOutputFilterByType DEFLATE text/html