Letzburgesch or Luxembourgian (in French, Luxembourgeois; in German, Luxemburgisch; in Luxembourgish Lëtzebuergesch) is a West Germanic language spoken in Luxembourg. It was adopted as an official language in 1984. It is also spoken in small parts of Belgium, France and Germany
Luxembourgish belongs to the Middle German group of High German languages, like standard German. However, it's not intelligible to most Germans, as it is more than just a german dialect. It borrows many French words. For example, the verb to propose is proposieren from the French proposer, which in German would be verschlagen.
Standard German is called "High German" in Luxembourg, where it is used for official purposes.