I18n: Update translation ast (91%).

254 translated messages, 25 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ast (93%).

260 translated messages, 19 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ast (97%).

272 translated messages, 7 untranslated messages.

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