I18n: Update translation hr (85%).

243 translated messages, 40 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation sl (62%).

176 translated messages, 107 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation sl (74%).

211 translated messages, 72 untranslated messages.

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