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.
I18n: Update translation ca (99%).

207 translated messages, 1 untranslated message.

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

208 translated messages.

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

208 translated messages.

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

208 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation hr (98%).

205 translated messages, 3 untranslated messages.

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

208 translated messages.

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

208 translated messages.

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