add Exit to toolbar menu

[maherzaidoune]

add exit to toolbar menu to quit the app
add Exit translation to all xml string file

Signed-off-by: Maher Zaidoune [email protected]

[gaul]

Why does this app need an exit menu? I can't think of any other apps that do this. Just open the task list and swipe to quit.

[maherzaidoune]

many apps using that design model uses Exit in the toolbar menu, the app just have setting , so i add exit

[naXa777]

Stack Overflow: Is quitting an application frowned upon?

A "quit" or "exit" application button is considered useless with Android's application model.