Use new xdg function to set environment.
I18n: Update translation id (100%).

69 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation pl (100%).

69 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation it (100%).

69 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation cs (100%).

69 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation kk (100%).

69 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).