v0.316.2: two more leftovers on the data tab

Biztonsagi mentes was still a card — it sits directly in the tab, not inside a section, so the
.app-section scoping rule did not reach it. It is a section now.

The 2nd-copy heading still read '2. mentes beallitasa — <app>', because the locale key carries the
app name: it was a PAGE title, and a tab already says which app it is. New key
app_page.second_backup ('2. mentes' / 'Second backup'). This is the leftover the task named.

Found by looking at the rendered page, not the markup.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117kRTSgs3rJWUFGxyoWN6Y

CHANGELOG.md

@@ -9,6 +9,10 @@ second push of the old one.
   off — the input itself still reads as a field. Scoped to `.app-section`, so the install page keeps
   its own form. Found in a browser by asking the rendered page which elements still paint a
   background, rather than reading the markup and guessing.
+- Two more leftovers on „Adatok és mentés", found in the same look: „Biztonsági mentés" was still a
+  card (it was not inside a section, so the scoping rule above did not reach it), and the 2nd-copy
+  heading still read „2. mentés beállítása — <app>" because its locale key carries the app name —
+  it was a PAGE title, and the tab already says which app this is. New key `app_page.second_backup`.
 
 ## v0.316.1 — the asset tag actually reaches the dashboard pages (2026-10-15)