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

frontend/src/lib/youtubeErrors.ts

@@ -1,16 +1,16 @@
 import { HttpError } from "./api";
 import { markReported } from "./api/core";
-import { notify } from "./notifications";
+import { msg, notify, type NotifText } from "./notifications";
 import { notifyActionError } from "./actionErrors";
 import i18n from "../i18n";
 
 // A YouTube-gated action (subscribe, sync, backfill, unsubscribe) that 403s means the user hasn't
 // granted the write scope — surface a "Connect" affordance instead of a vague failure. Pass
 // `onConnect` to offer the connect-wizard button (callers that have no wizard handle, e.g. the
-// channel page, just get the message). `fallbackMessage` is the already-translated non-403 error.
+// channel page, just get the message). `fallbackMessage` is what a non-403 error says.
 export function notifyYouTubeActionError(
   err: unknown,
-  fallbackMessage: string,
+  fallbackMessage: NotifText,
   onConnect?: () => void,
 ): void {
   const httpErr = err instanceof HttpError ? err : null;
@@ -18,7 +18,7 @@ export function notifyYouTubeActionError(
     // A 403 on a YouTube write action means the write scope isn't granted — offer to connect.
     notify({
       level: "error",
-      message: i18n.t("channels.notify.needYouTube"),
+      message: msg("channels.notify.needYouTube"),
       action: onConnect
         ? { label: i18n.t("channels.notify.connect"), onClick: onConnect }
         : undefined,