Feature: Add language-switch toolbar button and bilingual dialog

Add a 15th toolbar button "Lang/语言" after the Help button so Chinese
readers can switch language without knowing English; it opens the existing
language-select dialog. The dialog title is now bilingual ("切换语言 /
Switch Language") and its label/buttons use Chinese source strings
("语言:", "确定", "取消"), which still localize to en/de via
TranslateDialog. The toolbar bitmap is extended with a globe icon.

Co-Authored-By: deepseek-v4-pro

server/2015Remote/LangManager.h

@@ -709,7 +709,7 @@ protected:
 
     LPCDLGTEMPLATE CreateDialogTemplate()
     {
-        const WORD DLG_WIDTH = 200;
+        const WORD DLG_WIDTH = 260;
         const WORD DLG_HEIGHT = 75;
 
         m_templateBuffer.clear();
@@ -723,24 +723,24 @@ protected:
         AppendData(&dlgTemplate, sizeof(DLGTEMPLATE));
         AppendWord(0);  // 菜单
         AppendWord(0);  // 窗口类
-        AppendString(_T("Select Language"));
+        AppendString(_T("切换语言 / Switch Language"));
         AlignToDword();
 
         // 静态文本
         AddControl(0x0082, 15, 15, 50, 12, (WORD)-1,
-                   SS_LEFT | WS_CHILD | WS_VISIBLE, _T("Language:"));
+                   SS_LEFT | WS_CHILD | WS_VISIBLE, _T("语言:"));
 
         // ComboBox
-        AddControl(0x0085, 65, 13, 120, 150, 1001,
+        AddControl(0x0085, 65, 13, 180, 150, 1001,
                    CBS_DROPDOWNLIST | WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_VSCROLL, _T(""));
 
         // OK 按钮
-        AddControl(0x0080, 45, 50, 50, 14, IDOK,
-                   BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, _T("OK"));
+        AddControl(0x0080, 75, 50, 50, 14, IDOK,
+                   BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, _T("确定"));
 
         // Cancel 按钮
-        AddControl(0x0080, 105, 50, 50, 14, IDCANCEL,
-                   BS_PUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, _T("Cancel"));
+        AddControl(0x0080, 135, 50, 50, 14, IDCANCEL,
+                   BS_PUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, _T("取消"));
 
         return (LPCDLGTEMPLATE)m_templateBuffer.data();
     }