fix(notifications): a notice's button is said when shown, like its text

An action label was translated when the notice was raised, so after a language switch a live
toast or center row read in one language with its button in the other. The access-requests nudge
no longer re-issues on a switch for it. New tests: the button and a server refusal follow a
switch.

frontend/src/modules/notifications/NotificationsPanel.menu.dom.test.tsx

@@ -9,7 +9,7 @@ import { afterEach, describe, expect, it, onTestFinished, vi } from "vitest";
 import { act, cleanup, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { api, type AppNotification } from "../../lib/api";
-import { raw, type Notification as ClientNotif } from "../../lib/notifications";
+import { msg, type Notification as ClientNotif, raw } from "../../lib/notifications";
 
 const h = vi.hoisted(() => ({
   server: [] as unknown[],
@@ -295,7 +295,7 @@ describe("NotificationsPanel · an activity row", () => {
     h.client = [
       client(7, {
         dismissed: false,
-        action: { label: "feed.undo", onClick: () => {} },
+        action: { label: msg("feed.undo"), onClick: () => {} },
         meta: { kind: "video-hidden", videoId: "v", channelId: "c" },
       } as never),
     ];
@@ -321,8 +321,8 @@ describe("NotificationsPanel · an activity row", () => {
     h.client = [
       client(5, {
         dismissed: false,
-        action: { label: "tray.done.copyLink", onClick: copy },
-        secondaryAction: { label: "tray.done.open", onClick: open },
+        action: { label: msg("tray.done.copyLink"), onClick: copy },
+        secondaryAction: { label: msg("tray.done.open"), onClick: open },
       }),
     ];
     mount();