Replace string with special character in product page title

[razvy]

I need to replace a certain string with a special character in Smarty file. For example replace "xxxstarxxx" with ⭐ character in the title of the product page.

I've tried to change the header.tpl file of the theme in order to do that, but it doesn't work. I've tried with both decimal and hexadecimal HTML code of the ⭐ character.

<title>{$meta_title|replace:'xxxstarxxx':'⭐'|escape:'html':'UTF-8'}</title>

I gues the syntax isn't good, I know very little about Smarty and how Prestashop code works.

What code should I use in order to accoplish this?

 

Thanks!