[Xfce-i18n] Translated strings move from xfwm4 to libxfce4ui

[Nick Schermer]

Hi,

FYI: Jerome moved the keyboard shortcut strings from xfwm4 into the 
private kbd library in libxfce4ui. He also merged the translations, but 
some are now fuzzy.

Status here: 
https://translations.xfce.org/projects/p/libxfce4ui/c/master/

Nick