UI loading improvements

Fixed: Caching for dynamically loaded JS files
Fixed: Incorrect caching of initialize.js
(cherry picked from commit f0cb5b81f140c67fa84162e094cc4e0f3476f5da)

frontend/src/Utilities/String/translate.ts

@@ -0,0 +1,39 @@
+import createAjaxRequest from 'Utilities/createAjaxRequest';
+
+function getTranslations() {
+  return createAjaxRequest({
+    global: false,
+    dataType: 'json',
+    url: '/localization',
+  }).request;
+}
+
+let translations: Record<string, string> = {};
+
+export async function fetchTranslations(): Promise<boolean> {
+  return new Promise(async (resolve) => {
+    try {
+      const data = await getTranslations();
+      translations = data.Strings;
+
+      resolve(true);
+    } catch (error) {
+      resolve(false);
+    }
+  });
+}
+
+export default function translate(
+  key: string,
+  args?: (string | number | boolean)[]
+) {
+  const translation = translations[key] || key;
+
+  if (args) {
+    return translation.replace(/\{(\d+)\}/g, (match, index) => {
+      return String(args[index]) ?? match;
+    });
+  }
+
+  return translation;
+}