I18n: Update translation fr (100%).

282 translated messages.

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

282 translated messages.

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

281 translated messages, 1 untranslated message.

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

282 translated messages.

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