l10n: add greek translation
l10n: add greek translation

New status: 6 messages complete with 0 fuzzies and 9 untranslated.

Transmitted-via: Transifex (translations.xfce.org).

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