Two things. First, based on the links in your first post, you probably want your rewrite rule to be this:
RewriteRule ^index/language/([A-Za-z0-9-]+)/?$ index.cfm?language=$1 [NC,L]
And second, I want to make sure your expectations are set appropriately. Even after this rewrite rule, the ugly-looking URL will still exist and still work. The rewrite rule allows the pretty-looking URL to work in addition to the ugly-looking URL. If you have HTML links, you'll need to update them to point to the new pretty-looking URL.