I18n: Update translation zh_CN (83%).

173 translated messages, 34 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
I18n: Update translation ru (94%).

195 translated messages, 12 untranslated messages.

Transifex (https://www.transifex.com/projects/p/xfce/).
Fix build with --disable-dpms