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I want to convert a Book that contains words in the latin transcription of an language that uses an other system. Is there a way to use more than one dictionary to recognize my language and the transcriptions of word from the other language?

One problem is that this https://de.wikipedia.org/wiki/%C4%80 is recognized as https://de.wikipedia.org/wiki/%C3%84.

I want to save the Book as ePub.