Add English and Russian ChatGUI interface translations

tools/chatgui/src/connmonitorwindow.cpp

@@ -1,3 +1,4 @@
+#include <QCoreApplication>
 // connmonitorwindow.cpp — ETCP connection monitor (standalone, non-modal window)
 #include "connmonitorwindow.h"
 #include "../transport/gui_bridge.h"
@@ -31,7 +32,7 @@ static void connMetricsCb(const uint8_t* data, int len) {
 ConnMonitorWindow::ConnMonitorWindow(QWidget* parent)
     : QDialog(parent)
 {
-    setWindowTitle("Connection Monitor");
+    setWindowTitle(QCoreApplication::translate("ChatGui", "Connection Monitor"));
     resize(900, 550);
     setAttribute(Qt::WA_DeleteOnClose);
     setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
@@ -40,7 +41,7 @@ ConnMonitorWindow::ConnMonitorWindow(QWidget* parent)
     mainLayout->setSpacing(4);
     mainLayout->setContentsMargins(8, 8, 8, 8);
 
-    auto* title = new QLabel("Active ETCP Connections (10 fps)", this);
+    auto* title = new QLabel(QCoreApplication::translate("ChatGui", "Active ETCP Connections (10 fps)"), this);
     title->setStyleSheet("font-weight: bold; font-size: 13px;");
     mainLayout->addWidget(title);
 
@@ -63,7 +64,7 @@ ConnMonitorWindow::ConnMonitorWindow(QWidget* parent)
     m_details->setStyleSheet(
         "QPlainTextEdit { border: 1px solid palette(mid); border-radius: 4px;"
         " padding: 8px; background: palette(base); }");
-    m_details->setPlaceholderText("Select a connection to view metrics");
+    m_details->setPlaceholderText(QCoreApplication::translate("ChatGui", "Select a connection to view metrics"));
 
     splitter->addWidget(m_connList);
     splitter->addWidget(m_details);