fix(notifications): a notice keeps what to say and says it in the reader's language when shown

frontend/src/features/video/AddToPlaylist.tsx

@@ -13,6 +13,7 @@ import { useAnchoredPopover } from "../../components/ui/anchoredPopoverHooks";
 import { IconButton } from "../../components/ui/IconButton";
 import { MembershipMenu } from "../../components/ui/MembershipMenu";
 import { SURFACE } from "../../components/ui/surfaces";
+import { msg } from "../../lib/notifications";
 
 // A small anchored menu for toggling a video's membership in the user's playlists, with inline
 // "new playlist" creation. Its body is the shared MembershipMenu (as the channel tag editor's).
@@ -122,7 +123,7 @@ function MembershipPanel({
         old?.map((p) => (p.id === pl.id ? { ...p, has_video: !p.has_video } : p)),
       );
     } catch (e) {
-      notifyActionError(e, t(pl.has_video ? "playlists.removeFailed" : "playlists.addFailed"));
+      notifyActionError(e, msg(pl.has_video ? "playlists.removeFailed" : "playlists.addFailed"));
     }
     refresh();
     setBusy(false);
@@ -137,7 +138,7 @@ function MembershipPanel({
       await addPlaylistItem(qc, pl, videoId);
       made = true;
     } catch (e) {
-      notifyActionError(e, t("playlists.addFailed"));
+      notifyActionError(e, msg("playlists.addFailed"));
     }
     refresh();
     setBusy(false);

frontend/src/features/video/stateNotice.ts

@@ -1,5 +1,5 @@
 import i18n from "../../i18n";
-import { notify, resolveVideo } from "../../lib/notifications";
+import { msg, notify, resolveVideo } from "../../lib/notifications";
 import type { Video, VideoStatus } from "../../lib/api";
 
 /** What a notice names the video by; any of it may be unknown to the surface that marked it. */
@@ -24,8 +24,8 @@ export function announceVideoState(
   const hidden = status === "hidden";
   notify({
     message: video?.title
-      ? i18n.t(hidden ? "feed.hiddenNamed" : "feed.markedWatchedNamed", { title: video.title })
-      : i18n.t(hidden ? "feed.hidden" : "feed.markedWatched"),
+      ? msg(hidden ? "feed.hiddenNamed" : "feed.markedWatchedNamed", { title: video.title })
+      : msg(hidden ? "feed.hidden" : "feed.markedWatched"),
     action: { label: i18n.t(hidden ? "feed.undo" : "feed.unwatch"), onClick: undo },
     meta: {
       kind: hidden ? "video-hidden" : "video-watched",