fix(i18n): the video menu's download row says "Download…", and counted copy is pluralized

- The row opens the download dialog, so it is labelled so; the download's state ("Downloaded",
  "In queue") is its hint, not its label.
- The share dialog's expiry ("1 days") and a link's view count ("1 views") go through i18next's
  plural forms (`count`).

frontend/src/components/ShareDialog.tsx

@@ -160,7 +160,7 @@ function LinkRow({ link, onChanged }: { link: ShareLink; onChanged: () => void }
       </div>
       <div className="flex items-center gap-2 text-xs text-muted flex-wrap">
         <span className="inline-flex items-center gap-1">
-          <Eye className="w-3 h-3" /> {t("downloads.share.views", { n: link.view_count })}
+          <Eye className="w-3 h-3" /> {t("downloads.share.views", { count: link.view_count })}
         </span>
         {badges.map((b) => (
           <span
@@ -307,7 +307,7 @@ function LinkShare({ job }: { job: DownloadJob }) {
               >
                 {d === null
                   ? t("downloads.share.expiryNever")
-                  : t("downloads.share.days", { n: d })}
+                  : t("downloads.share.days", { count: d })}
               </Button>
             ))}
           </div>