guide:update po
guide:add Desktop class
Merge branch 'develop' of github.com:linuxdeepin/dde into develop
lib:session_register fix DBus path
guide:update DesktopCorner page
desktop:update signals.coffee
Merge branch 'develop' of github.com:linuxdeepin/dde into develop
res:dock:: fix system tray problem.

1. fix input region gets wrong when mouse is out of system tray.
2. change preview border size when the window size is changed.
Merge branch 'develop'