feat(i18n): Hungarian words for the English loanwords, one name per thing (E30 S5)

The D3 list: Feed, Shorts, Admin, Token, Port stay; stream, Prio, Job, Audit, Demo, Auto, Info,
Frontend/Backend, Backfill and transcode get the Hungarian word (közvetítés, Prioritás, Feladat,
Eseménynapló, Demó, Automatikus, Infó, Felület/Szerver, videók behúzása, átkódolás). The final sweep
also took out reset/sync/reconcile/setup/logs/whitelist/email, and three features that went by two
names: access requests (kérés/kérelem), backfill (betöltés/behúzás), and the connection test
("Check the connection" beside "Test connection", in both languages). Two quota actions shared one
Hungarian name. The playlists rail title and two of its sort labels are shorter so they fit.
DESIGN.md Copy: the rule and its decision-log row.

frontend/src/components/ConfigPanel.tsx

@@ -143,7 +143,7 @@ export default function ConfigPanel() {
       notifyActionError(e, t("config.plexTestFailed"));
     },
   });
-  // Bug reports' "Check the connection" (E16): the repository answers, takes issues, is private.
+  // Bug reports' "Test connection" (E16): the repository answers, takes issues, is private.
   const testIssues = useMutation({
     mutationFn: () => api.testIssues(),
     onSuccess: (r) =>