i18n: back-fill daemon-startup hardening strings

Additively adds translations for the 6 new keys from this batch
(sb_daemon_extract_failed, sb_daemon_files_failed, loading_stall_{title,body,hint},
sb_plaintext_remote_blocked) across res/lang/*.json. es/de/fr/pt/ru get all 6; for
zh/ja/ko a string is only added when every glyph is already in the current
NotoSansCJK-Subset.ttf, since the subset can't be rebuilt here — 6 zh/ja/ko entries
whose glyphs aren't yet subsetted are left on the English fallback rather than render
as tofu. Written sorted, indent=4, ensure_ascii=False (matching add_missing_translations.py);
purely additive (42 insertions, 0 removals). The remaining 6 need a
scripts/build_cjk_subset.py font rebuild.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

res/lang/ja.json

@@ -734,6 +734,9 @@
     "lite_working": "処理中…",
     "loading": "読み込み中...",
     "loading_addresses": "アドレスを読み込み中...",
+    "loading_stall_body": "デーモンは %.0f 秒間初期化しています。アップデート後や初回起動時（ブロックインデックスの読み込みや再スキャン）は正常な場合があります。準備ができ次第、自動的に接続します。",
+    "loading_stall_hint": "まだ動かない場合は、設定を開いて「デーモンを再起動」を使うか、コンソールで詳細を確認してください。",
+    "loading_stall_title": "予想より時間がかかっています",
     "loading_transactions": "トランザクションを読み込み中",
     "local_hashrate": "ローカルハッシュレート",
     "low_spec_mode": "省電力モード",