Code refactoring (#2785)

* chore: pretty theme menu in sidebar

* refactor: renaming component templates

* refactor: create custom `a-statistic` component

* fix: display button text only on large screens

* chore: remove loading background in overview page

* fix: show `Version` text when xray version is unknown

web/translation/translate.ru_RU.toml

@@ -67,6 +67,9 @@
 "emptyReverseDesc" = "Нет добавленных обратных прокси."
 
 [menu]
+"theme" = "Тема"
+"dark" = "Темная"
+"ultraDark" = "Ультра темная"
 "dashboard" = "Статус системы"
 "inbounds" = "Подключения"
 "settings" = "Настройки панели"