Enhance power menu reboot option

* Use our old reboot icon
* Set correct dialog title & message when rebooting
* Move strings to cm_strings
* Add back reboot_download string used by samsung devices
* Remove Chinese translations, will be handled through crowdin

Change-Id: I3ba0e20dcdba0a295a071304048eebab6cfcf49d
Add an option to change the device hostname (1/2).

This adds an option to modify the device hostname used
in ip resolution. This is useful when connecting to the
android device in a dynamic dhcp environment.

Change-Id: I44e4771f4415a32fe66867d4dd90f1ad138341e1