I think you will find it much easier if you convert all your non latin text to &#xnnnn; format which your browser will understand, yet uses only standard Latin characters.

sub htmlX($) # Convert to Html &#xnnnn; notation
 {my ($s) = @_;
  my $t = '';
  $t .= (ord($_) < 128 ? $_ : sprintf("&#x%04x;", ord($_))) for split(
+//, $s);
  $t
 }
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You might also find this web page helpful: http://www.rishida.net/tools/conversion/