Şunu deneyin;
Options +FollowSymLinks
RewriteEngine On

RewriteRule ^betazair-([A-Za-z0-9-]+)-([0-9]+).html$ sayfa.php?id=$3&lang=$1 
RewriteRule ^haber-([A-Za-z0-9-]+)-([0-9]+).html$ haber.php?id=$3&lang=$1 
RewriteRule ^galeri-([A-Za-z0-9-]+)-([0-9]+).html$ galeri.php?id=$3&lang=$1 
RewriteRule ^galeri.html galeri.php?lang=$1 
RewriteRule ^video.html video.php?lang=$1 
RewriteRule ^haberler.html haber.php?lang=$1 
RewriteRule ^index.html index.php?lang=$1 
RewriteRule ^insan-kaynaklari.html insan-kaynaklari.php?lang=$1 
RewriteRule ^referanslar.html referans.php?lang=$1 
RewriteRule ^iletisim.html iletisim.php?lang=$1