Add bootstrap download dialog and fix 100 missing translation keys

- New BootstrapDownloadDialog accessible from Settings page
  - Stops daemon before download, prevents auto-restart during bootstrap
  - Confirm/Downloading/Done/Failed states with progress display
  - Mirror support (bootstrap2.dragonx.is)
- Add bootstrap_downloading_ flag to prevent tryConnect() auto-reconnect
- Right-align Download Bootstrap + Setup Wizard buttons in settings
- Add 100 missing i18n keys to all 8 language files (de/es/fr/ja/ko/pt/ru/zh)
  - Includes bootstrap, explorer, mining benchmark, transfer, delete blockchain,
    force quit, address label, and settings section translations
- Update add_missing_translations.py with new translation batch

src/app.cpp

@@ -37,6 +37,7 @@
 #include "ui/windows/export_transactions_dialog.h"
 #include "ui/windows/address_label_dialog.h"
 #include "ui/windows/address_transfer_dialog.h"
+#include "ui/windows/bootstrap_download_dialog.h"
 #include "ui/windows/console_tab.h"
 #include "ui/pages/settings_page.h"
 #include "ui/theme.h"
@@ -630,7 +631,8 @@ void App::update()
     } else if (core_timer_ >= active_core_interval_) {
         core_timer_ = 0.0f;
         if (!connection_in_progress_ &&
-            wizard_phase_ == WizardPhase::None) {
+            wizard_phase_ == WizardPhase::None &&
+            !bootstrap_downloading_) {
             tryConnect();
         }
     }
@@ -1356,6 +1358,9 @@ void App::render()
     // Address-to-address transfer confirmation
     ui::AddressTransferDialog::render();
 
+    // Bootstrap download from settings
+    ui::BootstrapDownloadDialog::render();
+
     // Windows Defender antivirus help dialog
     renderAntivirusHelpDialog();
     
@@ -2357,6 +2362,20 @@ void App::deleteBlockchainData()
     }).detach();
 }
 
+bool App::stopDaemonForBootstrap()
+{
+    bool wasRunning = isEmbeddedDaemonRunning();
+    if (wasRunning) {
+        DEBUG_LOGF("[App] Stopping embedded daemon for bootstrap download...\n");
+        if (rpc_ && rpc_->isConnected()) {
+            try { rpc_->call("stop"); } catch (...) {}
+            rpc_->disconnect();
+        }
+        onDisconnected("Bootstrap");
+    }
+    return wasRunning;
+}
+
 double App::getDaemonMemoryUsageMB() const
 {
     // If we have an embedded daemon with a tracked process handle, use it