Notification toasts, nicer loading, add new user support

frontend/src/components/Loading.tsx

@@ -0,0 +1,22 @@
+import { intl } from "src/locale";
+import styles from "./Loading.module.css";
+
+interface Props {
+	label?: string;
+	noLogo?: boolean;
+}
+export function Loading({ label, noLogo }: Props) {
+	return (
+		<div className="empty text-center">
+			{noLogo ? null : (
+				<div className="mb-3">
+					<img className={styles.logo} src="/images/logo-no-text.svg" alt="" />
+				</div>
+			)}
+			<div className="text-secondary mb-3">{label || intl.formatMessage({ id: "loading" })}</div>
+			<div className="progress progress-sm">
+				<div className="progress-bar progress-bar-indeterminate" />
+			</div>
+		</div>
+	);
+}