Logout on window close also in instanttranslate and termportal

Implement logoutOnWindowClose also in termportal and instanttranslate.

To ensure that this is triggered only on the last opened window/tab each application should increase a counter in the localStorage. Only if the last window is closed the logout should be performed.

The counter must also be used when opening multiple translate5 tasks in different tabs.

the logoutOnWindowClose config should also be evaluated in termportal and instanttranslate.

Pay attention that instanttranslate has two ways of inclusion - with and without termportal.

See as reference: app.js::logoutOnWindowClose.

Since different JS frameworks are used each applet must implement its own function.