I18n: Update translation ast (100%).

734 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation nb (89%).

654 translated messages, 80 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation nb (95%).

701 translated messages, 33 untranslated messages.

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