Catching old (broken) urls

Hi,

I’m looking for a way to catch and redirect old (as in previous site on
the
same domain) url’s.
For example, a request to /kunstenaars/detail.php?.. should be 301
redirected to /nl/kunstenaars.
I’ve tried doing so with the .htaccess file found in the public dir of
my
project as well as vendor/radiant/public’s, which doesn’t seem to be
working… Anybody know why the .htaccess changes aren’t picked up, or of
an
other way to accomplish this?