I18n: Add new translation ms (56%).

118 translated messages, 90 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/).