I18n: Update translation it (100%).

67 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation hr (56%).

38 translated messages, 29 untranslated messages.

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

67 translated messages.

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