Function interpolate

frontend/src/react/components/BannersWrapper.test.tsx:47–53

(key: string, values?: Record<string, unknown>)

};

function interpolate(key: string, values?: Record<string, unknown>) {
  let result = translations[key] ?? key;
  for (const [name, value] of Object.entries(values ?? {})) {
    result = result.replaceAll(`{{${name}}}`, String(value));
  }
  return result;
}

vi.mock("react-i18next", () => ({
  useTranslation: () => ({