support for incognito mode

src/i18n/en.json

@@ -11,6 +11,7 @@
   "label_message_sound": "Message sound:",
   "label_push_notifications": "Notification alerts:",
   "label_push_notifications_disabled": "Notification alerts (requires HTTPS):",
+  "label_incognito_mode": "Incognito mode:",
   "title_tag_manager": "Tags (user discovery)",
   "label_user_contacts": "Contacts:",
   "label_user_id": "Address:",

src/i18n/ru.json

@@ -152,5 +152,6 @@
   "topic_block_warning": "Вы действительно хотите заблокировать этот чат?",
   "search_no_results": "Ничего не найдено",
   "deleted_content": "удалено",
-  "image_caption_prompt": "Подпись к фото"
+  "image_caption_prompt": "Подпись к фото",
+  "label_incognito_mode": "Режим инкогнито:"
 }

src/i18n/zh.json

@@ -152,5 +152,6 @@
   "search_no_results": "搜索返回任何结果",
   "deleted_content": "内容已删除",
   "image_caption_prompt": "图片标题",
-  "menu_item_send_retry": "重试"
+  "menu_item_send_retry": "重试",
+  "label_incognito_mode": "无痕模式："
 }