i18n slice 1 release C: storage, sharing, sign-in, guest, catch-all and debug pages in English

- 11 templates converted (storage, storage_network, storage_init, storage_attach, sharing, login,
  claim, launcher_shared, launcher_share_password, catchall, debug); every key translated.
  Six ASCII-only Hungarian JS fragments the extractor missed were found by eye and converted by hand
  (", majd a(z)", "FIGYELEM:", "jelenlegi:", "mp", "p", " db").
- login, claim, both guest share pages and the catch-all render through executeTemplateLang (the
  household language; no session CSRF, no escrow reminder). renderLogin now takes the request.
- Page titles: TitleKey for storage, network storage, the two drive wizards and sharing.
  TestHandlerTitleKeysMatchHungarianTitle pins handler literal == hu.json value for every TitleKey.
- Tests: TestDirectRenderHandlersFollowLanguage (real routes, en + hu),
  TestI18nDirectRenderPagesHaveNoAdminChrome (escrow reminder due; none on the guest page).
- Fixture correction: the release C cases had invented page titles; the cases now carry the handlers'
  real titles (and the wizard pages their real page name), and those 12 fixtures were RE-CAPTURED from
  the unconverted templates at 0555091. The diff to the old fixtures is the <title> line (and the nav
  highlight on the two wizard pages) only.
- i18n gate: HU_FORMAL_CEILING 12 -> 16 — four more „ön" forms in the converted copy, unchanged by rule (R-516).

Hungarian: byte-identical (TestI18nParity against fixtures from unconverted templates).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/templates/launcher_shared.html

@@ -1,18 +1,18 @@
 {{define "launcher_shared"}}
 <!DOCTYPE html>
-<html lang="hu">
+<html lang="{{T "layout.html_lang"}}">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="robots" content="noindex, nofollow">
-    <title>Indítópult</title>
+    <title>{{T "launcher_shared.inditopult"}}</title>
     <link rel="icon" type="image/svg+xml" href="/static/favicon.svg">
     <link rel="stylesheet" href="/static/style.css">
 </head>
 <body class="guest-body">
 <main class="guest-content">
     <div class="page-header">
-        <h2>Indítópult</h2>
+        <h2>{{T "launcher_shared.inditopult"}}</h2>
         <span class="domain-badge">{{.Domain}}</span>
     </div>
     {{if .Apps}}
@@ -34,7 +34,7 @@
     </div>
     {{else}}
     <div class="empty-state">
-        <p>Jelenleg nincs elérhető alkalmazás.</p>
+        <p>{{T "launcher_shared.jelenleg_nincs_elerheto_alkalmazas"}}</p>
     </div>
     {{end}}
 </main>