I18n: Update translation zh_TW (100%).

207 translated messages.

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

207 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation de (97%).

201 translated messages, 6 untranslated messages.

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

207 translated messages.

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

207 translated messages.

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

207 translated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Fix issues with FreeBSD

This loweres the minimum upower version to support FreeBSD 10 out
of the box and fixes a couple other issues. The get_string_sysctl
function came from:
http://cgit.freedesktop.org/upower/tree/src/freebsd/up-util.c
I18n: Update translation fr (100%).

207 translated messages.

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