osd display:change osd display switch method

1.changed osd switch monitors ue(after user choose the switchMode and
        then switch the monitor)
2.when osd switch monitors ui show, the current display mode is selected
3.translate mgsid in zh_CN.po

4.spawn_command use async method
5.update listchoose css
6.use osdHide() instead of quit() in SwitchMode

7.donot connnect dbus signal of SwitchMonitors

8.
problem-Final:
    super + p :cannot switch choose monitors
reason of Final:
    the grab of osd is confict with grab of MediaKey
    and the gdk_keyboard_grab return 1 (GDK_GRAB_ALREADY_GRABBED) when
    use super + p
resolve of Final:
    before gdk_keyboard_grab , g_usleep(500*1000).
    and it will return 0 == GDK_GRAB_SUCCESS

9.move ungrab from coffee to osd.c
10.g_timeout_add for keyboard_grab util it grab succeed

tower:https://tower.im/projects/8a6342c556be4c4eb898fdd7fd6fcb2f/todos/51e67e67674d4f0cb3c009345602d60c/

Change-Id: I722fb866d2bebf8429fc3c2caf4eb828da8e2e8b