Replace < with &lt; and > with &gt; even when character set is not default

modules/Pisg/Common.pm

@@ -200,6 +200,9 @@ sub htmlentities
         $str =~ s/Å/Å/go;
         $str =~ s/Æ/Æ/go;
         $str =~ s/Ø/Ø/go;
+    } else {
+        $str =~ s/\</\&lt;/go;
+        $str =~ s/\>/\&gt;/go;
     }
 
     return $str;