I18n: Update translation lv (64%).
I18n: Update translation lv (64%).

9 translated messages, 5 untranslated messages.

Transifex (https://www.transifex.com/xfce/public/).

xfce-mirror/xfce4-genmon-plugin,tonypaulic/xfce4-genmon-plugin,xfce-mirror/xfce4-genmon-plugin,tonypaulic/xfce4-genmon-plugin,xfce-mirror/xfce4-genmon-plugin,tonypaulic/xfce4-genmon-plugin