Ok. Thanks for the hint. I have now in the folder with the old spelling changed the filenames:
de-DE.aff → de-AT.aff
de-DE.dic → de-AT.dic
and in the file locales there changed:
de-DE →de-AT
Using language designation "de-DE" for new and "de-AT" for old spelling seems to work. Thanx!
Changing the language in content.opf seems to require a restart of the editor.
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