In the haggadot which belonged to my grandfather ז”ל, there is a note on the translation for Adir Hu which mentions that they follow an old Yiddish version of the song, rather than the modern German translation.
Are there any other Ashkenazi communities, other than the German ones, where it was common to sing vernacular or Yiddish songs during Nirtzah, either instead of the Hebrew/Aramaic ones, or in addition?