I used what you suggested...
But made a little change myself.
Instead of using the "title" field from nuke_modules table i get the custom_title instead...
Just edited the file dynamic_titles.php and put this:
(...)
include("db/db.php");
$resultcustomtitle = $db->sql_query("SELECT custom_title FROM ".$prefix."_modules WHERE title='$name'");
$rowcustomtitle = $db->sql_fetchrow($resultcustomtitle);
$translated_module = $rowcustomtitle['custom_title'];
// Forums
if($name=="Forums"){
(...)
And use the $translated_module var when generating the titles instead of $name