i18n(chat): translate the tier-3 larger-message strings (8 languages)

Translate the five new chat strings — chat_parts_label, chat_txns_label,
chat_parts_explain, chat_parts_explain_multi, chat_receiving_large — into de, es,
fr, ja, ko, pt, ru, zh (res/lang/*.json, 2504 → 2509 keys each), additively and
matching each file's existing terminology for transaction / fee / message. The
transaction abbreviation uses each locale's natural short form (Tx / tx / 件 /
건 / транз. / 笔).

Rebuilt the CJK subset font (NotoSansCJK-Subset.ttf, 2111 → 2115 glyphs) for the
four new glyphs the translations introduce (产 割 拆 in zh, 뉩 in ko) so they
render instead of tofu.

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

res/lang/zh.json

@@ -323,7 +323,11 @@
     "chat_opt_global_clock": "全局时间格式",
     "chat_opt_poll": "轮询频率",
     "chat_opt_timestamp": "时间戳",
+    "chat_parts_explain": "这条长消息会作为一笔交易发送，拆分成这些部分——它和普通消息一样快送达。",
+    "chat_parts_explain_multi": "这条消息太大，无法放入一笔交易，因此会拆分到多笔交易中发送。接收方需等所有部分都到达后才能看到，因此送达较慢，且每笔交易都会产生网络手续费。",
+    "chat_parts_label": "部分",
     "chat_pick_contact": "从联系人中选择…",
+    "chat_receiving_large": "正在接收大消息…",
     "chat_rename": "重命名联系人",
     "chat_rename_hint": "联系人名称",
     "chat_renamed": "联系人已重命名",
@@ -394,6 +398,7 @@
     "chat_ts_24h": "24小时",
     "chat_ts_global": "跟随全局",
     "chat_ts_global_short": "全局",
+    "chat_txns_label": "笔",
     "chat_unblock": "取消屏蔽",
     "chat_unblocked_toast": "会话已取消屏蔽",
     "chat_unhide": "取消隐藏",