for MPP-3817: redirect inactive users to new account_inactive page

frontend/pendingTranslations.ftl

@@ -124,3 +124,5 @@ upsell-banner-4-masks-us-cta = Upgrade to { -brand-name-relay-premium }
 
 -brand-name-mozilla-monitor = Mozilla Monitor
 moz-monitor = { -brand-name-mozilla-monitor }
+
+api-error-account-is-inactive = Your account is not active.

frontend/src/pages/accounts/account_inactive.module.scss

@@ -0,0 +1,6 @@
+@import "~@mozilla-protocol/core/protocol/css/includes/lib";
+
+.error {
+  background-color: $color-red-60;
+  color: $color-white;
+}

frontend/src/pages/accounts/account_inactive.page.tsx

@@ -0,0 +1,18 @@
+import type { NextPage } from "next";
+
+import { Layout } from "../../components/layout/Layout";
+import { useL10n } from "../../hooks/l10n";
+import styles from "./account_inactive.module.scss";
+
+const AccountInactive: NextPage = () => {
+  const l10n = useL10n();
+  return (
+    <Layout>
+      <div className={styles["error"]}>
+        {l10n.getString("api-error-account-is-inactive")}
+      </div>
+    </Layout>
+  );
+};
+
+export default AccountInactive;

privaterelay/allauth.py

@@ -2,7 +2,7 @@
 from urllib.parse import urlencode, urlparse
 
 from django.http import Http404
-from django.shortcuts import resolve_url
+from django.shortcuts import redirect, resolve_url
 from django.urls import resolve
 
 from allauth.account.adapter import DefaultAccountAdapter
@@ -54,3 +54,6 @@ def is_safe_url(self, url: str | None) -> bool:
         # The path is invalid
         logger.error("No matching URL for '%s'", url)
         return False
+
+    def respond_user_inactive(self, request, user):
+        return redirect("/accounts/account_inactive/")