This is interesting in a kind archeological way. According to an article in the WaPo there is a children’s book writer in Luxembourg who has started writing in Letzebuergesch (or, Luxembourgish). This country of a half a million apparently needs a patriotic shot in the arm (more than a third of it’s residents are foreign born) so some are now writing for the first time in this off-shoot of German. Up until now this obscure language has only been used for oral communication. It had been assumed that the language is not sophisticated enough for the subtleties necessary in written expressions. Some claim otherwise. Here is short intro to the language , if you have nothing better to do.