feat: support monochrome tray icon

src/locales/en.json

@@ -122,6 +122,7 @@
   "Traffic Graph": "Traffic Graph",
   "Memory Usage": "Memory Usage",
   "Proxy Group Icon": "Proxy Group Icon",
+  "Tray Icon": "Tray Icon",
   "Menu Icon": "Menu Icon",
   "Monochrome": "Monochrome",
   "Colorful": "Colorful",

src/locales/ru.json

@@ -122,6 +122,7 @@
   "Traffic Graph": "График трафика",
   "Memory Usage": "Использование памяти",
   "Proxy Group Icon": "Иконка Группы прокси",
+  "Tray Icon": "Иконка лотка",
   "Menu Icon": "Иконка меню",
   "Monochrome": "Монохромный",
   "Colorful": "Полноцветный",

src/locales/zh.json

@@ -122,6 +122,7 @@
   "Traffic Graph": "流量图显",
   "Memory Usage": "内存使用",
   "Proxy Group Icon": "代理组图标",
+  "Tray Icon": "托盘图标",
   "Menu Icon": "菜单图标",
   "Monochrome": "单色图标",
   "Colorful": "彩色图标",