You need to add it to the dictionary in studio/polyglot.php?page=pgt_keys. Create a new key by clicking the "New Key" button and setting the Key Name to __ZAR, along with the corresponding language key in English or any other language exemple: ZAR.

Wow... nice to have you around lol.. Thx @Romulus

a:1:{s:4:"sign";s:7:"R";}

The sign must R, but it refuse to show.