I18n: Update translation fr (100%).

78 translated messages.

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

78 translated messages.

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

78 translated messages.

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