Yiddish – the holy language, is a very nice little booklet, meant to arouse Jews to the beauty of their esrtwhile mame loshon, and to remind them that even some seemingly insignificant phrases had their origins behar’rei kodesh. Obviously that doesn’t relate to the 14th century German, which is the bulk of it, nor to the incorporated Polish, Russian, Humgarian, and Romanian words, such as kishke and pastromale. They sure taste good, but, unless served at a tish, have zero holiness.
Gevaldig! Peledig! Moiradig! Vunderbar! Oisgetzoichent!….. and not meant to be a halachic work by any stretch of imagination. Not true? For one, it was written in English, the language that the author’s own children speak far better than Yiddish. Were it a halacha, the mechaber, who is a very big talmid chochom AND a posek of note, would have insisted on “Yiddish only” at home, as, incidentally, Rav Avigdor Miller did.