Try to fix /language/ redirect

the previous attempt redirect /language/ to /language.html/.
This if for issue #1461

html/.htaccess

@@ -6,6 +6,8 @@ RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=permanent,L]
 RewriteCond %{HTTP_HOST} ^doc.perl6.org [NC]
 RewriteRule ^(.*)$ https://docs.perl6.org/$1 [R=permanent,L]
 
+RewriteRule ^language/?$ https://docs.perl6.org/language.html [R,L]
+
 # We no longer need this, as we swapped the generator to not use the $COLONs on
 # non-Windows operating systems. Since we used that earlier, rewrite in reverse
 # in case someone is using the long and awful URLs
@@ -24,8 +26,6 @@ RewriteRule       ^(/?routine/.*/[^/]*?)%5E([^/%5E]*)$       $1\$CIRCUMFLEX_ACCE
 
 RewriteRule ^type/(.*?)\$REVERSE_SOLIDUS(.*) /type/$1%5c$2 [N]
 
-Redirect 301 /language      https://docs.perl6.org/language.html
-Redirect 301 /language/     https://docs.perl6.org/language.html
 Redirect 301 /language/5to6 https://docs.perl6.org/language/5to6-nutshell
 Redirect 301 /examples      http://examples.perl6.org/
 Redirect 301 /examples.html http://examples.perl6.org/