I18n: Remove broken / unsupported translations.

See http://users.xfce.org/~nick/broken-i18n/ for files and logs.

Use https://www.transifex.com/projects/p/xfce/ to upload fixed versions or request a translation team.
Drop empty po file.
Remove unneeded files.
I18n: Update translation hr (100%).

31 translated messages.

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

31 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Add new translation uz (83%).

26 translated messages, 5 untranslated messages.

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

31 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Add new translation en_AU (100%).

31 translated messages.

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

31 translated messages.

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