I18n: Update translation ast (84%).

175 translated messages, 33 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ast (99%).

207 translated messages, 1 untranslated message.

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