In my imported documents, all umlauts are replaced by "?". An umlaut is a symbol that is written over vowels in German and some other languages to indicate how they should be pronounced. For example, the word "für" has an umlaut over the "u". Also, in Word documents, the spaces for lists, e.g. in numbered sections, are filled with "?". Consequently, I would have to replace these spaces and the umlauts in order to carry out a check correctly. However, this is not the purpose of software that is supposed to perform a quick check. The error is reproducible, and now what?