# Add missing trailing slashes to directories if a matching .html does not exist.
# If it's a request to a directory.
RewriteCond %{SCRIPT_FILENAME}/ -d
# And a HTML file does not (!) exist.
RewriteCond %{SCRIPT_FILENAME}.html !-f
# And there is not trailing slash redirect to add it.
RewriteRule [^/]$ %{REQUEST_URI}/ [R=301,L]

emin değilim ama
bunu htaccess e koy bi bakalım (tabi önce yedekle)