i18n(chat): translate the sensitive-conversation strings (8 languages)

Back-fills the 29 new chat_sensitive_* keys additively into de/es/fr/pt/ru/zh/
ja/ko (2474 -> 2503 each), matching each file's established terminology and —
critically — keeping the sensitive "passphrase" worded distinctly from the
"seed phrase" (e.g. de Passphrase vs Seed-Phrase, es contraseña vs frase de
recuperación, fr phrase secrète vs phrase de récupération), translated +
reviewed per language. Rebuilds NotoSansCJK-Subset.ttf (2107 -> 2111 glyphs)
for 4 new CJK glyphs (ja 論; ko 눌/똑/론) the new strings introduced.

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

res/lang/zh.json

@@ -345,6 +345,35 @@
     "chat_send": "发送",
     "chat_send_failed": "未发送",
     "chat_sending": "发送中…",
+    "chat_sensitive_btn_mark": "设为私密",
+    "chat_sensitive_btn_setup": "设置并设为私密",
+    "chat_sensitive_btn_unlock": "解锁",
+    "chat_sensitive_btn_unlock_mark": "解锁并设为私密",
+    "chat_sensitive_btn_unlock_unmark": "解锁并设为普通",
+    "chat_sensitive_btn_unmark": "设为普通",
+    "chat_sensitive_err_create": "无法设置私密聊天保险库。",
+    "chat_sensitive_err_pass": "两次输入的密码短语不一致，或为空。",
+    "chat_sensitive_err_unlock": "密码短语错误。",
+    "chat_sensitive_lock_btn": "锁定私密会话",
+    "chat_sensitive_mark_tip": "设为私密",
+    "chat_sensitive_mark_title": "将此会话设为私密？",
+    "chat_sensitive_pass2_hint": "确认密码短语",
+    "chat_sensitive_pass_hint": "密码短语",
+    "chat_sensitive_setup_label": "为私密会话创建一个密码短语",
+    "chat_sensitive_toast_marked": "会话现已设为私密",
+    "chat_sensitive_toast_unlocked": "私密会话已解锁",
+    "chat_sensitive_toast_unmarked": "会话已设为普通",
+    "chat_sensitive_unlock_body": "输入您的私密聊天密码短语，以重新显示您的私密会话。",
+    "chat_sensitive_unlock_btn": "解锁私密会话",
+    "chat_sensitive_unlock_label": "输入您的私密聊天密码短语",
+    "chat_sensitive_unlock_title": "解锁私密会话",
+    "chat_sensitive_unmark_body": "此会话将不再使用您的私密聊天密码短语加密。新消息将像其他任何会话一样存储。",
+    "chat_sensitive_unmark_tip": "私密——点击可更改",
+    "chat_sensitive_unmark_title": "将此会话设为普通？",
+    "chat_sensitive_warn_1": "其消息将在此设备上以一个单独的密码短语加密——而非您的助记词。日后任何仅凭您的助记词恢复钱包的人，都将看不到此会话。",
+    "chat_sensitive_warn_dir": "您在此发送的消息受到完全保护。收到的消息仍保留在区块链上，理论上，拥有您助记词及其他软件的人有可能将其恢复——但没有您的密码短语，DragonX 本身绝不会显示它们。",
+    "chat_sensitive_warn_hist": "此会话中已有的消息仍可从链上恢复；此功能将完全保护此后的新消息。",
+    "chat_sensitive_warn_lose": "如果您丢失此密码短语，这些消息将永远消失——它们无法通过您的助记词恢复。",
     "chat_settings_done": "完成",
     "chat_settings_section": "聊天与联系人",
     "chat_settings_tip": "聊天自定义",