ui: fix codeLang-sub-select

packages/ui-default/utils/substitute.js

@@ -1,8 +1,11 @@
+/**
+ * @param {string} str
+ * @param {any} obj
+ * @returns {string}
+ */
 export default function substitute(str, obj) {
   return str.replace(/\{([^{}]+)\}/g, (match, key) => {
-    if (obj[key] !== undefined) {
-      return String(obj[key]);
-    }
+    if (obj[key] !== undefined) return obj[key].toString();
     return `{${key}}`;
   });
 }