introduction and about cache

frontend/src/pages/About.tsx

@@ -5,6 +5,8 @@ import MarkdownRender from '../components/MarkdownRender';
 import {observer} from 'mobx-react-lite';
 import commonStore from '../stores/commonStore';
 
+export type AboutContent = { [lang: string]: string }
+
 export const About: FC = observer(() => {
   const {t} = useTranslation();
   const lang: string = commonStore.settings.language;