feat: frontend unit tests

frontend/src/static/js/utils/helpers/replacementStrings.js

@@ -1,8 +1,15 @@
 // check templates/config/installation/translations.html for more
 
-export function replaceString(string) {
-    for (const key in window.REPLACEMENTS) {
-        string = string.replace(key, window.REPLACEMENTS[key]);
+export function replaceString(word) {
+    if (!window.REPLACEMENTS) {
+        return word;
     }
-    return string;
+
+    let result = word;
+
+    for (const [search, replacement] of Object.entries(window.REPLACEMENTS)) {
+        result = result.split(search).join(replacement);
+    }
+
+    return result;
 }