add is_livecd in lib/utils.c .h and repleace it in desktop.c greeter.c
greeter:delete all get_dbus in config and switchuser coffee
greeter:fixed not is_need_pwd and the login button now show
greeter:add language page
add resources/language
greeter:delete some echoconfig.coffee
add app/language
language:update
language:update js
language:test lang_list ok
language:start language-set command
update language CMakeLists.txt:install lanugage-set in langugae/lang/
guide:delete is_livecd