Fix: Decode geographic location as UTF-8 across client and server

Geographic location (city, country) from the geo APIs is UTF-8, but the client
and several server paths converted or stored it in the system ANSI code page,
turning umlauts ("ö"/"ä") into "?" or GBK mojibake ("B枚blingen"). Keep the
value UTF-8 end to end: the client caches it as UTF-8 and re-queries once after
an upgrade (keyed by __DATE__, the app's version convention), while the server
stores and displays it as UTF-8 in the online list, the activity log, the
client-info export, JSON/email payloads and search.

Also add a confirmation prompt before opening a remote chat from the toolbar,
with German, English and Traditional-Chinese translations.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/NotifyManager.cpp

@@ -205,7 +205,8 @@ void NotifyManager::BuildHostOnlineEmail(context* ctx, const std::string& matche
     // Get host info
     std::string computerName = CT2A(ctx->GetClientData(ONLINELIST_COMPUTER_NAME), CP_UTF8);
     std::string ip = CT2A(ctx->GetClientData(ONLINELIST_IP), CP_UTF8);
-    std::string location = CT2A(ctx->GetClientData(ONLINELIST_LOCATION), CP_UTF8);
+    // 地理位置已统一按 UTF-8 存储（见 AddList），直接透传，不再 CP_ACP→UTF-8 二次转换。
+    std::string location = ctx->GetClientData(ONLINELIST_LOCATION).GetString();
     std::string os = CT2A(ctx->GetClientData(ONLINELIST_OS), CP_UTF8);
     std::string version = CT2A(ctx->GetClientData(ONLINELIST_VERSION), CP_UTF8);