The Chofetz Chaim spoke Yiddish. In siman 307 of the mishna brurah he says on Shabbos you should say shabbos shalom instead of good morning. Then he adds, or say “shabbos tov” like we say in non-holy language. IE, gut shabbos or git shabbos. So yiddish is a non-holy language as per the poseik acharon.
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