UI: settings show/hide update display (#1072)

* UI: settings show/hide update display

This PR replaces the PR #1003

In this PR, the visual for available update is added to the foreground.

There are new settings to generally show/hide the update display, and only administrators receive the update display.

* change to `Bean`

* Update AppUpdateShowService.java

* add update message

* revision service

* change shouldShow

* Update githubVersion.js

* rm folder

* Update AppUpdateService.java

src/main/resources/messages_bg_BG.properties

@@ -112,6 +112,7 @@ navbar.settings=Настройки
 #############
 settings.title=Настройки
 settings.update=Налична актуализация
+settings.updateAvailable={0} is the current installed version. A new version ({1}) is available.
 settings.appVersion=Версия на приложението:
 settings.downloadOption.title=Изберете опция за изтегляне (за изтегляния на един файл без да е архивиран):
 settings.downloadOption.1=Отваряне в същия прозорец