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

controller/internal/web/testdata/i18n_parity/app_data_deployed.html

@@ -291,8 +291,8 @@ function appMigrate(btn,app,label){
 
 
 
-    <div class="deploy-cross-drive">
-        <h4>Biztonsági mentés</h4>
+    <div class="app-section deploy-cross-drive">
+        <h3>Biztonsági mentés</h3>
 
         <div class="cross-drive-nightly">
             <span class="form-hint" style="display:block;margin-top:.25rem">
@@ -305,7 +305,7 @@ function appMigrate(btn,app,label){
 
 
 <div class="app-section">
-    <h3>2. mentés beállítása — PrivateBin</h3>
+    <h3>2. mentés</h3>
 
     <p style="color:var(--text-3);font-size:.9rem;margin-top:0">
         A 2. mentés egy <strong>másik fizikai meghajtóra</strong> készít másolatot az alkalmazás