diff --git a/addons/website/static/lib/multirange/multirange_custom.js b/addons/website/static/lib/multirange/multirange_custom.js
index c4864989f47..a091a87361a 100644
--- a/addons/website/static/lib/multirange/multirange_custom.js
+++ b/addons/website/static/lib/multirange/multirange_custom.js
@@ -264,7 +264,8 @@ export class Multirange {
     }
 
     formatNumber(number) {
-        const locale = document.querySelector("html").getAttribute("lang");
+        const language = document.querySelector("html").getAttribute("lang");
+        const locale = language === "sr@latin" ? "sr-Latn-RS" : language.replace(/_/g, "-");
         let formatedNumber = number.toLocaleString(locale, {
             minimumFractionDigits: 2,
             maximumFractionDigits: 2,