my @langs = qw(ada cpp-qt pascal lscript z80 visualprolog
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povray c gettext);

my $text = join "", <STDIN>;
my $slang="/lang";
for (@langs) {
    $text =~ s|<$_>|<lang $_>|g;
    $text =~ s|</$_>|<$slang>|g;
}

$text =~ s|<code (.+?)>(.*?)</code>|<lang $1>$2<$slang>|sg;

print $text;