I18n: Update translation bg (100%).

739 translated messages.

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

739 translated messages.

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

739 translated messages.

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

739 translated messages.

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